Montgomery bounced back from an awful start May 1 against the Los Angeles Dodgers in which he gave up six runs in three innings.
Christian Walker, Gabriel Moreno and Pavin Smith also drove in runs for Arizona to keep Cincinnati winless in the month of May.
Reds starter Graham Ashcraft (3-2) allowed three runs and six hits through five innings, striking out two and walking three.
Ashcraft exited with two runners on and no outs in the sixth and the score tied at 2. Moreno singled home the go-ahead run before reliever Fernando Cruz worked out of the jam.
Suárez gave the Diamondbacks some breathing room with a two-out homer to center off Lucas Sims in the eighth.
TJ Friedl’s single in the ninth cut Arizona’s lead to 4-3. With one out and two runners on, reliever Joe Mantiply struck out pinch-hitter Will Benson and induced a fly ball to right from Jonathan India to seal it and earn his first save.
Stuart Fairchild and Jeimer Candelario also drove in runs for Cincinnati. Elly De La Cruz stole two bases to extend his major-league leading total to 21.
TRAINER’S ROOM
Reds: Put IB Christian Encarnacion-Strand (wrist) on the 10-day disabled list. Mike Ford, a 31-year-old journeyman first baseman, was signed to a one-year major league contract to take his spot on the roster. ... Put LHP Bandon Williamson (left shoulder strain) on the 60-day disabled list.
Lowder promoted to AA
The Cincinnati Reds promoted right-handed pitcher Rhett Lowder from the Single-A Dayton Dragons to the Double-A Chattanooga Lookouts on Wednesday.
Lowder, the No. 7 overall pick in the 2023 Major League Baseball Draft, was 2-0 with a 2.49 ERA in five starts with Dayton. He had 29 strikeouts in 25⅓ innings.
Lowder was the No. 2 prospect in the organization entering the season and the top prospect in the minor leagues.
The Dragons fell to 12-17 with an 8-1 loss at Lake County on Wednesday.
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