Latos (13-4) allowed five hits, struck out six and didn't walk a batter.
Arizona starter Trevor Cahill stuck out seven and gave up four hits, but also walked four and uncorked three wild pitches. Two of the wild pitches led to the first Cincinnati run.
Choo opened the Reds' third with a single and Cahill followed with a strikeout. But while walking Joey Votto, Cahill had two wild pitches that allowed Choo to reach third. He scored from there on a Brandon Phillips groundout.
Eury De La Rosa (0-1) replaced Cahill in the eighth and Choo greeted him with a single. Todd Frazier reached on an error by De Le Rosa with Choo advancing to third. Votto worked a walk, with the final pitch way inside and getting past catcher Wil Nieves for a wild pitch that allowed Choo to score the final run.
Sam LeCure pitched the ninth and earned his first career save despite giving up two singles.