The Reds went ahead 2-1 on back-to-back home runs from Josh VanMeter, his eighth, and Suárez, who hit his off the batter’s eye in center field.
Suárez drilled his second of the day a few feet to the left of where his first one landed.
Zac Gallen (3-6) was charged with three runs on five hits in 5 2/3 innings. He struck out five and walked two. Gallen has allowed three or fewer earned runs in each of his first 15 career starts, one of only two NL starters in history to do so.
Wilmer Flores lined a 1-2 pitch from Bauer into right-center field to drive in Alex Avila from second base with two outs in the bottom of the third, giving Arizona the early lead. Flores has 9 RBIs in his last 13 home games.
The Reds got out of that inning with Aristides Aquino’s throw from right field to third base to tag Flores trying to take an extra base on Ketel Marte’s single.
Reds: IF Freddy Galvis wasn't in the lineup because of a sore left knee. He left Saturday's game in the seventh inning.
Reds: RHP Sonny Gray (10-7, 2.80 ERA) is the scheduled starter against the Chicago Cubs in the opener of a three-game series Monday at Wrigley Field. Gray is 2-1 against the Cubs this season.