Diego Seguí

Diego Pablo Seguí González (; August 17, 1937 – June 24, 2025) was a Cuban professional baseball player. He played in Major League Baseball (MLB) as a right-handed pitcher for the Kansas City / Oakland Athletics, Washington Senators, Seattle Pilots, St. Louis Cardinals, Boston Red Sox, and Seattle Mariners. Seguí was a forkball specialist who was the 1970 American League ERA leader.

Professional baseball career Seguí was born in Holguín, Cuba.

In 1970 with Oakland, Seguí went 10–10 with two saves in 47 appearances (19 starts) while leading the American League pitchers with a 2.56 ERA.

Seguí holds the unique distinction of having pitched for both of Seattle's major league baseball teams, the Pilots and the Mariners, in the first game ever played by each franchise. In these contests, he earned a hold for the Pilots in 1969, and absorbed the opening-day loss for the Mariners in 1977.

His most productive season came in 1969 for the Pilots, when he posted career-highs in wins (12) and saves (6), against only 6 losses.

Seguí also pitched with four teams in the Venezuelan Winter League during 15 seasons between 1962 and 1983. He posted a 95–58 record and a 2.76 ERA in 213 games, setting a league's all-time record with 941 strikeouts, to surpass Aurelio Monteagudo (897) and José Bracho (748). This record is still unbeaten. He also ranks second in wins behind Bracho (109), third in complete games (68), and is fourth both in ERA and innings pitched .

Seguí was inducted into the Venezuelan Baseball Hall of Fame and Museum in 2003. He also gained induction into the Hispanic Heritage Baseball Museum Hall of Fame on August 19, 2006, in San Francisco, California. In 2024, he was given the Negro Leagues Beisbol Lifetime Achievement Award by the Negro Leagues Baseball Museum.

Segui died on June 24, 2025, at the age of 87. He is buried at Chapel Hill Funeral Home and Memorial Gardens in Kansas City.