The Best Arizona Diamondbacks Seasons and Every October Run

By 4Baseball Staff · November 5, 2026 · 11 min read

Ranks the best Arizona Diamondbacks seasons by record, then walks through all 14 postseason series from 1999 to 2023, including the 2001 championship, the 2023 pennant and the swept series in between.

The Arizona Diamondbacks have reached the postseason in seven of their first 28 seasons, won two National League pennants and one World Series. That is a thin October résumé next to the game's old powers, but it is a surprisingly dramatic one. The club's only championship came in 2001, in its fourth year of existence, one of the fastest titles ever won by an expansion team. Its second pennant, in 2023, came from a wild-card seed that had to go through Milwaukee, Los Angeles and Philadelphia before it ran out of road in the World Series.

This guide does two jobs. First it ranks the best regular seasons by winning percentage, using the historical record through the 2025 season, and says what each of those teams was made of. Then it goes through every postseason series the club has played, fourteen in all, in the order they happened. The totals are the club's own: 2,167 wins and 2,267 losses across 28 seasons, a .489 winning percentage, with five division titles and two wild-card berths along the way.

One thing is worth saying at the start. The best regular season in club history did not produce the title, and the title team was not the best regular-season team. That mismatch runs through most of the story below.

The best seasons by record

The historical record lists the franchise's best years by winning percentage among seasons of at least 100 games. Six clubs stand out, and five of them won the division outright.

Look at the right-hand column. The 1999 team won 100 games in its second season and lost in four. The 2002 team won 98 and did not win a postseason game. The one season on this list that ended in a parade is fifth by record. A reader could take that as proof that October is a lottery, and partly it is: a five-game series between two good teams is closer to a coin flip than most people want to admit. But each of these years had its own story, and they are worth taking one at a time.

The bottom of the record book is just as blunt. The 2004 club went 51-111, the worst record in team history, and the 2021 club went 52-110. The 2014, 2010 and inaugural 1998 teams went 64-98, 65-97 and 65-97. All five finished last in the five-team NL West. A franchise that has lost 110 or more games twice in 28 years and also won a World Series is an unusual object.

1999: a hundred wins in year two

The Diamondbacks began play in 1998 under manager Buck Showalter, lost 97 games, and then did something less common among expansion clubs: they signed established stars. The 1999 team went 100-62 and won the NL West. The mound was built around Randy Johnson, who won the first of four consecutive Cy Young Awards that year (the sheet lists 1999, 2000, 2001 and 2002). Luis Gonzalez, who also arrived in 1999, would become the club's all-time leader in home runs (224), hits (1,337), RBI (774) and runs (780) during an eight-year stay.

The 100-win team met the Mets in the division series and lost three games to one. The sheet gives no more detail than that, and it would be dishonest to invent any. What the record does show is a pattern that would repeat: a regular-season club strong enough to win the division comfortably, undone by a short series. A best-of-five exists, in part, to make that happen sometimes.

Showalter's tenure covered 486 games, 250 wins and 236 losses, and ended after the 2000 season. Along with Bob Brenly (303-262), he is one of only two managers in the club's top ten by games to finish above .500 with the Diamondbacks.

2001: the title that arrived in year four

Brenly took over for 2001, and the club went 92-70 to finish first in the NL West. It had the fewest wins of the first three division winners, but it had the best pitching pair in the game. Johnson won his third Cy Young, and Curt Schilling, who pitched for the club from 2000 through 2003, won 58 games in those four seasons. The historical sheet credits Johnson with 118 wins in a Diamondbacks uniform.

The path went through three rounds, and the sheet records each:

1. NLDS against St. Louis: the Diamondbacks won, 3-2.
2. NLCS against Atlanta: the Diamondbacks won, 4-1.
3. World Series against the New York Yankees: the Diamondbacks won, 4-3.

The Yankees had won the three previous championships, and a seven-game win against them is the loudest line on the Arizona record. It is well documented that Game 7 ended in the bottom of the ninth inning, when a single by Luis Gonzalez off Mariano Rivera drove in the winning run, and that Johnson and Schilling shared the World Series MVP award. Beyond that, the series is best remembered by people who watched it, and this article stays with the results.

The club's first game came in 1998. A championship that quickly required a roster of players acquired in their primes, a very different recipe from the draft-and-develop model that usually takes a decade. The cost of that approach showed up later, and the sections below come back to it.

2002: ninety-eight wins and a sweep

The 2002 team is the second-best regular season in the history of the club, 98-64, and it won the division again. Johnson won his fourth straight Cy Young Award. The lineup still had Gonzalez and Steve Finley, who hit 153 home runs for the club over 1999 through 2004, and the rotation still had Johnson and Schilling at the top.

And it was swept by the St. Louis Cardinals in the division series, 0-3.

The 2002 sweep is the cleanest example of what a short series can do to a great team. A division series lasts three to five games, so a team that won 98 times over 162 games gets a tiny sample in which to show its edge. The sheet cannot say how the three games unfolded, so this article will not guess. What the result does show is that having the same two aces that had just won a championship was no guarantee of anything the following October. The pattern fits the franchise's first era: two division titles, a championship and a first-round exit within four seasons, then a long slide.

Brenly's tenure ended during 2004, his record with the club standing at 303-262 over 565 games. That year finished 51-111. Al Pedrique managed 83 games and went 22-61.

2007 and 2011: the division winners that fell short

Two more NL West titles followed in the next decade. They look alike in the standings and were built differently.

The 2007 team, managed by Bob Melvin, went 90-72 and finished first, the lowest win total of any Arizona division winner. The Diamondbacks swept the Cubs in the NLDS, 3-0, then met the Colorado Rockies in the NLCS and were swept themselves, 0-4. That Rockies club had reached the postseason after a late surge, and it is covered in the Colorado Rockies history. For Arizona, the lesson of 2007 is that a 90-win team that sweeps one round is still only a few bad days from being swept in the next.

The 2011 team, managed by Kirk Gibson (353-374 across 727 games from 2010 through 2014), was the best of the pair at 94-68, a 29-win improvement on the 2010 team that had gone 65-97. Paul Goldschmidt debuted that season and would become the club's second-leading home-run hitter, with 209 homers and 710 RBI in a Diamondbacks uniform behind only Gonzalez. The division series with Milwaukee went the full five games, and Arizona lost 2-3. A deciding game is the cruelest way to lose a series, because there is nothing to hold onto except the margin.

Both teams were good. Neither is remembered the way the 2001 team is, and that is mostly because of the October result.

2017: a wild-card ride and a sweep

The 2017 season brought the franchise's first wild-card berth. Torey Lovullo took over as manager, a job he would hold through 2025 (664-691 in 1,355 games, the club record). The team went 93-69 and finished second in the NL West behind the Dodgers, the fourth-best record in franchise history.

The wild-card game was a one-game series against the Colorado Rockies, and Arizona won it. In the division series they met the Los Angeles Dodgers, who had won the division, and were swept 0-3. The Dodgers' history shows what that franchise built over the following years. For Arizona, 2017 was a reminder that a wild-card team has to win two series to get anywhere, and the second one is usually against a club that has had days of rest.

2023: the pennant nobody expected

The 2023 team is the one the current generation of Arizona fans will remember. It qualified as a wild card, and Corbin Carroll won the NL Rookie of the Year award that season. The club's path:

• Wild Card Series against Milwaukee: won 2-0.
• Division series against the Dodgers: won 3-0. Los Angeles was the club that had swept Arizona in 2017 and had dominated the division for years, and this is the cleanest reversal in the table below.
• NLCS against Philadelphia: won 4-3.
• World Series against Texas: lost 1-4.

The Diamondbacks won their first five games of the 2023 postseason, two against Milwaukee and three against the Dodgers, then needed all seven games to get past Philadelphia. That is nine wins and three losses before the World Series began. Texas then won four of five. Over the whole run, the club went 10-7 in postseason games.

It was the second pennant in club history, 22 years after the first. The two World Series trips ended differently. The 2001 team won in seven. The 2023 team lost in five.

What 14 series add up to

Counting every postseason series on the sheet, Arizona has won 8 and lost 6. Counting games, the record is 28 wins and 29 losses, which includes the one-game wild-card win in 2017. That is almost a perfectly even October, a fair description of a franchise that has been neither dominant nor irrelevant.

Two features of the table are worth flagging. The first is that the club's postseason success clusters in two years, 2001 and 2023, which account for six of the eight series wins. The second is the shape of the losses. Three of the six series defeats were sweeps (2002, 2007 and 2017), one went the full five games (2011), one was a 1-3 loss in 1999, and the last was the 2023 World Series. When Arizona has lost a series, it has usually lost it quickly.

The pitching and hitting behind the eras

A few names carry the franchise's records. Randy Johnson holds the club marks for wins (118) and strikeouts (2,077), with 14 shutouts against 8 for Brandon Webb. Johnson's 2.83 ERA and Webb's 3.27 are the only two entries on the sheet's list of pitchers with at least 1,000 innings for the club. The sheet shows Johnson as the only Hall of Fame player with four or more seasons in a Diamondbacks uniform, with eight, a number that reflects two stints (1999 through 2004, then 2007 and 2008).

Webb won the 2006 Cy Young Award, the fifth by a Diamondbacks pitcher after Johnson's four, and he won 87 games for the club from 2003 through 2009, second only to Johnson. The rotation of the 2010s and 2020s leaned on Zac Gallen (65 wins, 1,017 strikeouts) and Merrill Kelly (62 wins), who sit third and fourth on the win list.

On the batting side, Gonzalez's .298 average and 224 home runs lead the club, Goldschmidt (.297, 209 home runs) is a close second, and Ketel Marte, with 168 home runs through 2025, is third in homers. Tony Womack leads in stolen bases with 182, and Corbin Carroll's 123 steals in four seasons (2022 through 2025) already rank third. On the saves list, Jose Valverde holds the club record with 98.

What October rewards, and what it does not

Three points explain much of the mismatch between regular-season strength and postseason results.

First, short series amplify chance. Suppose a 100-win team has a 55 percent chance of beating a 90-win opponent in any single game. That is an illustration, not a measured figure, but it shows the principle: over five games the better club wins somewhat more than half the time, not nearly all of it. Even very strong teams lose a five-game series to a decent one often enough that it happens to most great clubs at some point.

Second, pitching depth matters differently in October. Over a season, five starters share the work. In a series, a manager can lean on three or four, and a team whose strength is its fifth starter and its depth gets less out of it. The 2001 team had two of the best pitchers in the game. The 2002 team had the same two and was swept. Both facts are true at once, which is the honest summary of how little a rotation guarantees.

Third, the seed matters. In 2023 the Diamondbacks went through a wild-card round, which the format used in 2022 and after makes harder: no division title means no first-round bye. The fact that they still won three rounds is why the run has become the club's second-best chapter.

Common questions

When did the Diamondbacks win the World Series? In 2001, by beating the New York Yankees in seven games, 4-3. It remains the club's only championship through 2025.

How many pennants have they won? Two, in 2001 and 2023. The 2023 team lost the World Series to Texas, 1-4.

What is the best regular-season record in club history? 100-62 in 1999, in the club's second season. That team lost its division series to the Mets, three games to one.

Who has managed the most games for the club? Torey Lovullo, with 1,355 games from 2017 through 2025 and a record of 664-691. Kirk Gibson (727 games) and Bob Melvin (677) follow.

Did the Diamondbacks ever lose 110 games? Yes, twice: 51-111 in 2004 and 52-110 in 2021. Both seasons ended in fifth place.

Where does the club play? Chase Field in Phoenix. The historical park listing shows Bank One Ballpark as the home from 1998 through 2005 and Chase Field from 2006 through 2025. The site's reference data gives it a retractable roof and a capacity of 48,330.

Where to go next

For the full arc of the club, read the Diamondbacks franchise history, and for the players behind these results, the best players in Arizona history. The park has its own entry in the Chase Field guide, and the background on the championship round is in the history of the World Series. Current standings and schedules are on the Diamondbacks team page, and the park is listed at Chase Field.