Laz Díaz

Lazaro Antonio Díaz Sr. (born March 29, 1963) is an American umpire in Major League Baseball. He joined the American League's full-time staff in 1999, and has worked throughout both major leagues since 2000. Díaz was promoted to crew chief for the 2022 season, becoming the second full time Latino crew chief, after Alfonso Marquez.

Early life and amateur career Díaz was born in 1963 in Florida to a father and mother who had immigrated from Cuba in 1961 and 1962 respectively. After high school, he played college baseball at Florida Memorial College.

Career Prior to beginning his professional umpiring career, Díaz played one minor league season in the Minnesota Twins organization as an outfielder and a shortstop. He split the 1984 season between the Elizabethton and Kenosha Twins, and the Visalia Oaks. After being released at the end of the season, Díaz made two more attempts at being signed by a major league team. He tried out for the St Louis Cardinals in 1986, and was a spring training invite for the New York Yankees in 1987 before ending his playing career. The fan, Eric Dybas, a self-described Cubs fan, had attended a game at Wrigley Field earlier in the day and had been drinking all day. Laz stifled the attack, and the fan was later sentenced to up to 180 days in jail and one month of probation for aggravated battery.

Díaz was the second base umpire when Barry Bonds broke Hank Aaron's career home run record. On July 23, 2009, Díaz was the third base umpire for Mark Buehrle's perfect game.

He has worked the World Series in 2007, 2017 and 2020, the American League Championship Series in 2009, 2015, 2016, and 2021, the Division Series in 2002, 2006, 2007, 2013, 2014, 2017 and 2020 and the Wild Card in 2020, 2021 and 2022. He also umpired the All-Star Game in 2000 and 2010.

Díaz is featured in Pepsi commercials with the Detroit Tigers' Johnny Damon, the Minnesota Twins' Joe Mauer and broadcaster Gary Thorne.

On March 7, 2010, Díaz was inducted to the Cuban Hall of Fame.

During a game on May 30, 2012, Díaz got into an unusual argument with New York Yankees catcher Russell Martin. According to Martin, Díaz punished the catcher for disputing the strike zone by not letting him throw new baseballs out to the pitcher (a preference of Martin's) and claiming that this ability had to be "earned". MLB Executive VP for Baseball Operations Joe Torre spoke to Díaz and Martin about the incident, but Martin said he did not expect any disciplinary action for either man.

MLB selected Diaz to officiate its 2014 Opening Series at the Sydney Cricket Ground in Sydney, Australia, during March 20–23, 2014.

On July 5, 2026, USA Today's Bob Nightengale reported that Diaz was one of seven umpires who had accepted a buyout from Major League Baseball to retire after the 2026 season.