No. 1: May 7 walk-off win over the Nationals
The Phillies actually had two walk-off wins over the Nationals this season, but their second one on May 7 was much more dramatic.
That game was the last of a ten-game stretch where Philadelphia had to face three National League powerhouses in the Dodgers, Cubs, and Nationals. They had just one win in nine games heading into May 7.
Philadelphia had not done much offensively through most of the game, scoring two runs early on a double by Freddy Galvis but falling behind by a 5-2 score by the seventh inning. The team needed a spark late in the game if they wanted to steal a game from the top team in the NL East.
That spark came off the bat of Aaron Altherr. Cesar Hernandez and Daniel Nava singled earlier in the inning but were stuck on first and second with two outs. Altherr pinch-hit and delivered, hitting a game-tying home run to center field. It was his biggest play of the season in terms of win probability added and put the game on even footing heading into the ninth inning.
After no one scored in the ninth, Philadelphia came to bat in the bottom of the tenth and immediately loaded the bases. After Andres Blanco struck out, Galvis came to bat. He hit a deep sacrifice fly to center field, easily scoring Odubel Herrera from third base.
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Even though the Nationals are running away with the division and the Phillies are falling farther and farther into the cellar, they were still able to steal a game from the Nationals early on in the season.