Sidney Connor Thomas (born May 29, 1998) is an American professional baseball pitcher for the Milwaukee Brewers of Major League Baseball (MLB). He made his MLB debut in 2025.
Amateur career
Thomas attended Tift County High School in Tifton, Georgia. As a junior in 2015, he went 8–1 with a 0.67 ERA. Unselected in the 2016 Major League Baseball draft, he enrolled at Georgia Tech where he played college baseball.
In 2017, as a freshman at Georgia Tech, Thomas pitched 10+1⁄3 innings in which he gave up 13 earned runs. As a sophomore, he moved into the starting rotation, going 7–4 with a 3.34 ERA and 106 strikeouts over 97 innings and fifteen games. In 2019, his junior year, Thomas made 16 starts in which he compiled a 9–2 record and 3.11 ERA over 113 innings.
Professional career
St. Louis Cardinals
The St. Louis Cardinals drafted Thomas in the fifth round, with the 155th overall selection, of the 2019 Major League Baseball draft. Thomas signed with the Cardinals and made his professional debut with the State College Spikes of the Low-A New York–Penn League before being promoted to the Peoria Chiefs of the Single-A Midwest League in July. Over 43 innings pitched between the two clubs, he went 4–1 with a 3.77 ERA. Thomas did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.
To begin the 2021 season, Thomas was assigned to the Springfield Cardinals of the Double-A Central. After compiling a 4.87 ERA over 20+1⁄3 innings, he was promoted to the Memphis Redbirds of the Triple-A East. Over 22 games (14 starts) with Memphis, Thomas went 6–4 with a 3.10 ERA and 92 strikeouts over 101+2⁄3 innings. Thomas returned to Memphis for the 2022 season. Over 28 games (25 starts), he posted a 6–12 record with a 5.47 ERA and 110 strikeouts over 135 innings. He was selected to play in the Arizona Fall League (AFL) for the Salt River Rafters after the season. He compiled a 1.75 ERA and 34 strikeouts over 25+2⁄3 innings and was named the AFL Pitcher of the Year.
On November 15, 2022, the Cardinals selected Thomas' contract and added him to the 40-man roster to protect him from the Rule 5 draft. Thomas was optioned to Memphis to begin the 2023 season. He played the whole season there, appearing in 21 games (17 starts) and going 5–4 with a 5.53 ERA and 69 strikeouts over 94+1⁄3 innings. Thomas was designated for assignment on November 14, 2023, after multiple prospects were added to the 40-man roster. He cleared waivers and was sent outright to Triple-A on November 16.
Thomas returned to Memphis for the 2024 campaign, posting a 7-4 record and 2.89 ERA with 79 strikeouts and three saves in 90+1⁄3 innings pitched across 56 appearances.
Milwaukee Brewers
On December 11, 2024, the Milwaukee Brewers selected Thomas in the Rule 5 draft. On March 22, 2025, the Brewers announced that Thomas had made the team's Opening Day roster.