Gregory Omar Santos, a Dominican professional baseball pitcher for the San Francisco Giants of Major League Baseball, signed as an international free agent with the Boston Red Sox in 2015. Gregory was born on August 28, 1999.
In 2018, he pitched for the Salem-Keizer Volcanoes, earning a 2–5 record with a 4.53 ERA in 49+23 innings, and was selected as a Northwest League midseason All-Star.
In 2019, he pitched for the Augusta GreenJackets, finishing 1–5 with a 2.86 ERA in 34+23 innings. Due to shoulder concerns, Santos missed the second part of the 2019 season.
Santos did not appear in a game in 2020 since the minor league season was canceled due to the COVID-19 epidemic. Santos was added to the 40-man roster on November 20, 2020.
Santos got promoted to the top leagues for the first time on April 22, 2021. He made his MLB debut that day, pitching a scoreless inning of relief against the Miami Marlins, and was the NL’s sixth-youngest player.
He also struck out his first two big-league batters, Magneuris Sierra and Jazz Chisholm Jr., during the game.
Santos was optioned to the Giants’ auxiliary site in Sacramento on April 28 to make place for new outfielder Mike Tauchman.
Later that year, he began his minor league career with the Triple-A Sacramento River Cats. Santos was suspended for 80 games on June 29, 2021, after testing positive for the prohibited androgen and anabolic steroid Stanozolol.