Cincinnati (73-71) fell 7 1/2 games behind NL Central-leading Milwaukee with 18 games left.
St. Louis (63-79) has won four of five.
Zack Thompson (5-5) improved to 3-0 in his last four starts. allowing three runs and five hits in six innings with six strikeouts and three walks, The 25-year-old left-hander was selected 19th overall by the Cardinals in the 2019 amateur draft from the University of Kentucky.
Casey Lawrence, John King and Giovanny Gallegos each pitched a scoreless inning.
Ryan Helsley walked Christian Encarnacion-Strand leading off the ninth, and Tyler Stephenson hit a grounder to shortstop Masyn Winn for the forceout. Second baseman Tommy Edman’s throw to first wasn’t in time as Encarnacion-Strand barreled into Edman and flipped him, and a video review determined Encarnacion-Strand had committed a baserunning violation, and Stephenson was called out.
Helsley struck out Will Benson on a 102.1 mph full-count pitch for his eighth save in 10 chances.
Cincinnati’s David Bell was ejected for the major league-leading seventh time this year and the 27th time in his managing career, tossed in the fourth after Brennan Miller called a strike on a 2-0 pitch to Stephenson that appeared to be above the strike zone.
Stephenson flied out and Alejo López was ejected after saying something to Miller after a called third strike on a curveball that appeared to be high.
López, promoted on Saturday, started at second base after a pregame mishap. Reds third baseman Noelvi Marte sustained a facial cut when hit on the face with a throw by shortstop Elly De La Cruz when the rookies were tossing just before gametime.
Lineup cards already had been exchanged, and Marte was replaced at third by Spencer Steer, who originally scheduled to start at second. López became the Reds’ 64th player this season, two shy of team record
Contreras hit an RBI single in the first and tied the score 3-3 with a two-run homer in the third.,
Stephenson and Alejo López hit back-to-back RBI doubles during a three-run second that included Harrison Bader’s run-scoring single, his first RBI in eight games since the Reds acquired him from the New York Yanklees.
TRAINER’S ROOM
Cardinals: Edman swung and missed at pitch that hit him in the lower left thigh leading off the second inning. He stayed in the game and beat out an infield hit to third.
Reds: OF Stuart Fairchild was placed on the COVID-19 injured lost and LHP Alex Young was transferred from the 15-day injured list (left hamstring tightness) to the COVID-19 injured list. Young was on a rehab assignment with Triple-A Louisville.
UP NEXT
Reds RHP Hunter Greene (3-6, 4.75, 114 strikeouts) is scheduled to come off the COVID-19 injured list to start against Cardinals LHP Miles Mikolas (7-10, 4.63, 114 strikeouts) on Sunday.
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