Yaisel Sierra

Yaisel Sierra Pérez (born June 5, 1991) is a Cuban former professional baseball pitcher.

Career Cuban career Sierra played for Holguín and Sancti Spíritus in the Cuban National Series. He won with his national team, the gold medal of the 2014 Central American and Caribbean Games in Veracruz, Mexico.

In April 2015, Sierra defected from Cuba to the United States to pursue a Major League Baseball (MLB) career. Per reports on December 28, 2015, MLB cleared him as an unrestricted free agent eligible to sign with any team.

During a tryout in Florida in late 2015, Hudson Belinksky of Baseball America opined that Sierra appeared "extremely polished" with a "clean arm action," easily repeating "his moderate stride ... through release... consistently landing online and hitting his spots down in the strike zone." He threw a fastball in the mid 90s miles per hour and a slider. He was assigned to the Advanced-Class A Rancho Cucamonga Quakes, and was outrighted off the 40-man roster on July 3. In 20 games (13 starts for the Quakes and 10 relief appearances for the Double-A Tulsa Drillers, he was 6–7 with a 5.89 ERA, 86 strikeouts and 30 walks.

Sierra began the 2017 season with Tulsa and was promoted at mid-season to the Triple-A Oklahoma City Dodgers. Between the two teams, he was 5–1 with a 3.04 ERA in 39 relief appearances.

In 2021, Sierra made 23 appearances for Triple-A Oklahoma City, struggling to an 0-1 record with a 13.78 ERA and 18 strikeouts.