List of major league pitchers who have beaten all 30 teams

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Since 1998, there have been 30 teams in Major League Baseball (MLB). It is very rare for a pitcher to record a win against every team. In earlier times, two factors made it nearly impossible to defeat all teams in both leagues (even before expansion increased the number to 30):

• Before the era of free-agency, in which players are free to move to another team at the end of their contract, a pitcher would play for only a few teams, and could not, of course, win a game against his own team.
• Before inter-league play began in June 1997, a pitcher would see only half of the 30 teams in any single season, unless traded to a team in the other league. Even with inter-league play, a pitcher may not have his spot in a typical 5-man rotation match the games in the single 3- or 4-game series against another team, and only a few teams from the other league were played in any season prior to 2023.

In any case, defeating all teams is more likely only if a pitcher has a long career. In 2023, the MLB switched to a more balanced schedule, and for the first time in MLB history, every team played every other team in each league at least three times. MLB teams now play 1 three-game series against 14 of the other league's teams, with the home team switching every year, and 2 two-game series (one series at home, one away) against the team in the other league deemed their "geographic rival." They also play more games against non-division teams in their league, and as a result, play less intra-divisional games.^[1]

Because of the schedule changes, it is easier now than ever before for MLB pitchers to win a game against every team in the league. That being said, it is still an extremely difficult feat due to five different pitchers being in a starting rotation on any given team, the longevity and high winning percentage needed by a pitcher to be able to win games consistently, and other unforeseen and random barriers that very from player to player.