The Phillies play fumble on defense in the bottom of the second inning, leading to an unearned run and a 1-0 Diamondbacks lead. An error, a ball that could have been a double play and a passed ball gave Christian Walker the chance to turn an out into a run, and he comes all the way around to score.
The Phillies greatly improved their defense this season, so that was a very atypical inning for them.