When a pitcher throws a pitch and the batter doesn't hit it, the catcher can't stop it, and the runner (or runners) advance, that's a wild pitch. There were two outs in the top of the fourth inning, and the Dodgers' Ross Stripling was pitching with runners on first and third. Yasmani Grandal was behind the plate, and he held his glove out for Stripling's first pitch to Diamondbacks shortstop Chris Owings.