Yusmeiro Petit participant of 2020 Major League Baseball season
Oakland Athletics (2018–2021)
On December 7, 2017, Petit signed a two-year contract with the Oakland Athletics which includes a club option for 2020. Petit finished his first season with the A's with a 7-3 record and an even 3.00 ERA over 93 innings. He continued his success the following season, registering an ERA of 2.71 in 80 games, prompting the Athletics to exercise their option on him. In the shortened 2020 season, Petit recorded a 1.66 ERA in 21+2⁄3 innings.
On February 14, 2021, Petit resigned with the Athletics on a 1-year contract worth $2.55 million. In 2021, Petit logged 78 games of 3.92 ERA ball, striking out 37 in 78.0 innings of work. He became a free agent following the season.