How International Prospects Sign with MLB Clubs

By 4Baseball Staff · November 5, 2026 · 10 min read

How a teenager from the Dominican Republic or Venezuela, or a professional from Japan or Korea, ends up on an MLB contract: signing periods, bonus pools, trainers, the posting system and the paperwork.

In the 2025 season, 388 of the 1,465 players who appeared in a major-league game were born outside the 50 states, which is about 26.5 percent, according to the birthplace and appearance records in the historical record. More than a third of those players, 144 of them, were born in the Dominican Republic, and another 92 came from Venezuela. Many of those players did not enter professional baseball through the amateur draft that American high school and college players go through. They signed as teenagers, or as established professionals, under a separate set of rules.

This article explains how that process works: who counts as an international prospect, how the signing period and bonus pools limit what clubs can spend, what trainers and scouts do, how the posting system works for players from Japan and Korea, and what happens between a handshake and a contract. The details of these rules change with each labor agreement, so treat the figures below as a description of the system as of the 2025 season and check MLB for the current terms.

How many players come from abroad

The table counts, for selected seasons, the players who appeared in an American League or National League game and were born outside the United States. It includes Puerto Rico and Canada, whose amateur players are in the draft and not in the international system, so it overstates the number who signed internationally. The place of birth is not the same as the route into baseball; a player born in the Dominican Republic who moved to the United States as a child might have been drafted.

The shift between 1990 and 2000 is the story. The share rose from under 14 percent to nearly 24 percent in a decade, driven by the Dominican Republic and Venezuela, where clubs built academies and scouting networks. Across all of the historical record, the leading birthplaces for players who appeared in an AL or NL game are the Dominican Republic (930 players), Venezuela (499), Puerto Rico (287), Canada (248), Cuba (245), Mexico (152) and Japan (84). The Japanese count is small by comparison, but those players tend to arrive as established professionals, and their route into the majors is different.

The 2025 breakdown by birthplace shows how varied the pipelines are. Among the 388 players born outside the United States, 144 were born in the Dominican Republic, 92 in Venezuela, 33 in Cuba, 27 in Puerto Rico, 22 in Canada, 15 in Mexico, 14 in Japan, eight in Colombia and six in Panama, with a handful from places such as Curacao, South Korea, Nicaragua and Taiwan. Compare 2000, when the Dominican Republic had 104 players, Venezuela 44, Cuba 12, Japan 11 and Colombia three. Venezuela's total doubled in 25 years and Cuba's nearly tripled, while Japan's grew only slightly. The Japanese number is small because a Japanese player usually arrives after years in Nippon Professional Baseball, and only a limited number of players make that jump each year.

One caution about reading these counts. Birthplace is the only country field the database offers, and it says nothing about citizenship, about how or when a player signed, or about whether he came to the United States as an infant. A Canadian-born player who was drafted out of an American college and a Dominican teenager who signed at 16 look the same in this table. The numbers measure where players were born, which is a useful proxy for the international pipeline and not a precise count of it.

Who is an international prospect?

Under the rules, an amateur player who lives outside the United States, Canada and Puerto Rico is an international free agent. That means he is not eligible for the amateur draft and can sign with any club that has room in its budget. Players in the draft are mostly American high school and college players, plus players from Canada and Puerto Rico.

The age rule is the most important feature. A player generally must be 16 years old to sign, with cutoff dates set by the rules for when the birthday must fall. That is two years younger than the typical American high school draftee at 18. A player signed at 16 is a project: he may be a slight teenager with a good swing or a quick arm, and the club is betting on what he will become.

Clubs have a window for signing these players. For many years the international signing period opened on July 2. In recent years it has opened in January, and each period runs for a year. The exact dates are set in the labor agreement, so check the league's calendar.

Scouts, trainers and the road to a signing

A club does not find a 16-year-old by accident. Scouts work in the Dominican Republic, Venezuela and other countries, watching games and workouts years before a player is eligible. Many young players train with independent trainers, who run programs for teenagers, often starting around ages 12 or 13, and who act as intermediaries when the player is ready to sign. In the Dominican Republic these trainers are often called "buscones," and the trainer's role is widely reported to include a share of the signing bonus. The size of that share varies from case to case and we do not state a figure.

The system also has an informal side. Under the rules, a club may not make a binding agreement with a player before the signing period opens, but public reporting for years has described unofficial understandings between clubs and trainers about players as young as 14 or 15. Those understandings are not contracts. They are the reason the international draft debate exists, because critics argue that they put pressure on very young players and families, and that the system rewards whoever moves earliest. Our article on the international draft debate walks through the arguments for and against a draft.

MLB has taken steps to regulate the process, including registration requirements for trainers and showcases where clubs see players together. Tournaments also give scouts a look at older prospects; see our guide to the Premier12 and other international tournaments.

The signing period and the bonus pool

Each club has a budget for international amateur signings, called a bonus pool. The pool is set by the league and varies by club, with the amount in recent years being a few million dollars and tied to factors such as market size. Clubs cannot freely exceed the pool: spending above it triggers penalties, including taxes and limits on how much a club may spend in future periods. A club can also trade for additional pool space, and clubs do.

Two details matter.

1. Small bonuses are outside the pool. A bonus of $10,000 or less does not count against the pool, so clubs sign many teenagers for small amounts without affecting their budget. These players fill out rosters of the Dominican Summer League and often never advance.
2. A few players take a large share. Because the pool is fixed, each club decides how to divide it. Many clubs sign one or two top prospects for large bonuses and a long list of others for small ones. The headlines about big bonuses come from the top of the list; most signees receive far less.

A hypothetical example shows how the arithmetic works. Imagine a club with a pool of exactly $5 million, a round figure chosen only for illustration and not any club's actual pool. If the club signs its top prospect for $2.5 million, half the pool is gone. It might sign two more players for $750,000 each, leaving $1 million for everyone else. It can then sign as many players as it likes for $10,000 or less, since those bonuses do not count, and it can use the remaining money on a handful of players in the $50,000 to $200,000 range. The pool forces a club to decide whether to concentrate its spending on a few high-end prospects or spread it across many, and different clubs have chosen differently.

The big bonus is a signal of how a club rates a player, not of how he will turn out. Players who were highly paid at 16 have failed, and players who signed for a small amount have become major leaguers. The signing bonus is not even a good guide to the player's early development, because it also reflects how much negotiating leverage the trainer and player had.

The paperwork between handshake and contract

Once a player and a club agree on terms, the process is far from over.

• Age and identity verification. MLB investigates every international signee's identity and age. This requirement exists because of documented cases, over many years, of players who turned out to be older than they claimed or to be using a name that was not their own. A player's age affects how clubs value him, so falsification can change a signing's value.
• Medical examination. The club's doctors check the player's health, and the results can change or cancel a deal.
• League approval. The Commissioner's Office reviews and approves each contract.
• Visa and travel. To play in the United States, the player needs a work visa for professional athletes. Delays in this process have, at times, held players in the Dominican Republic for months.

After the contract is approved, the player usually begins in the Dominican Summer League, which is a rookie-level league played in the Dominican Republic and run by MLB for its clubs. Many clubs also run academies there, with housing, meals, training and, in many programs, English-language and general education classes. After a year or two, successful players move to the complex leagues in Arizona or Florida and then up the minor-league ladder.

Professionals from abroad: Japan, Korea and Taiwan

Players who already have careers in a foreign professional league follow a different path. A star in Nippon Professional Baseball or the Korea Baseball Organization is not an amateur free agent; his club owns his contract, and he can leave for MLB only through an agreement between the leagues.

For Japan, the arrangement is called the posting system. If a Japanese club agrees to let a player go, he is posted for a set window during which any MLB club may negotiate with him, and the club that signs him pays the Japanese club a fee on a sliding scale tied to the size of the contract. A player who has completed enough years of service can also become a free agent without posting, though the details are in the agreement between the leagues. Korea has a similar posting arrangement with its own terms, and Taiwan's league has its own rules. Our guides to the history of baseball in Japan, the Korean Baseball Organization and the CPBL in Taiwan describe those leagues in detail.

The league adds a special rule for younger professionals. A player under 25 who has not played enough years in a recognized professional league is treated, for signing purposes, like an international amateur. He is subject to the bonus pool and to the limits on contract size that come with it. That was the rule Shohei Ohtani faced when he signed in 2017, and it limited the money he could receive. Players age 25 and older with at least six years of professional experience are exempt from the pool and can sign a major-league contract at whatever the market pays.

Cuban players have faced additional obstacles because of restrictions between the United States and Cuba. Historically, many Cubans have had to leave the country and establish residency elsewhere before they could sign. Cuban stars also played in the Negro leagues in earlier decades, a link to the history covered in our article on the Negro Leagues. Players from Mexico come through a separate arrangement in which the Mexican club is compensated.

Reading an international signing story

When a headline says a club "signed the top international prospect for a record bonus," a few questions will help you read it.

• How old is the player? At 16, the gap between signing and the majors is often five years or more.
• Is the money counted in the pool? A large bonus means the club used a big share of its pool on one player.
• What do the scouting reports say about tools? Hitting, power, speed, arm and defense get grades, and a teenager's tools are projections.
• What are the odds? Most signees do not reach the majors. The Dominican Summer League is full of players who will not advance.

For news, scouting reports and results, use our international section and the world baseball topic page.

Common questions

At what age can a player sign? Generally 16, with cutoff dates set by the rules.

Are international players part of the draft? Not currently. As of the 2025 season, players outside the United States, Canada and Puerto Rico sign as free agents, and an international draft has been discussed but not adopted.

What is a bonus pool? A limit on how much each club can spend on international amateur signings in a signing period, with penalties for exceeding it.

How does a Japanese star reach the majors? Usually through the posting system, if his club agrees, or as a free agent after enough years of service.

Why do trainers matter? They develop young players and negotiate for them. Their role is a recurring subject in discussions about how to make the system fairer.

Where to go next

If you want to follow signings and international results, start with the international section and the minors pages. For the debate over changing the system, read the international draft debate, and for the stories of the stars who came through it, browse the world baseball topic page.