Lucas Sundberg Sims (born May 10, 1994) is an American professional baseball pitcher for the Cincinnati Reds of Major League Baseball. He is 6 feet 2 inches tall. He previously played for the Atlanta Braves.
Sims faced the Los Angeles Dodgers on August 1, 2017, in his major league debut. He pitched six innings, yielding three earned runs and recording three strikeouts.
The debuts of Sims and Ozzie Albies marked the first time since 1968 that the Atlanta Braves started two players making their first major league appearance on the same day.
He finished the season 3–6, with a 5.62 ERA. In December 2017, Braves manager Brian Snitker said that he might look at Max Fried, Sims, or another pitcher as the team’s fifth starter in 2018. Sims spent time with the major league team in spring training but began the 2018 season in Gwinnett.
On July 30, 2018, the Braves traded Sims, Matt Wisler, and Preston Tucker to the Cincinnati Reds in exchange for Adam Duvall. Sims started his first game as a Red on May 28, 2019, against the Pittsburgh Pirates.
In 2020, Sims went 3–0 with a 2.45 ERA and 34 strikeouts in 25+2⁄3 innings over 20 games in relief. In 2021, he went 5–3 with a 4.40 ERA and 76 strikeouts in 47 innings.