Keider Montero pitched five scoreless innings and Riley Greene drove in two runs to help the Detroit Tigers beat the San Francisco Giants 3-1 on Monday. Montero (2-1) entered the game with a 5.28 ERA in six games, but held the Giants to one hit and two walks while striking out three. Hayden Birdsong (2-1) took the loss, giving up three runs on five hits and two walks in 4 1/3 innings.