Smith tied the game at 2-2 with his 14th homer of the season, singled and scored in the A's four-run sixth, then cleared the bases with a double in the ninth, putting his signature on the victory, going 3-for-4 with three runs and four RBI.
While the Nationals and Reds each clinched playoff spots, the Phillies continue clinging to slim hopes of reaching the post-season, helping themselves with a 21-hit bombing of the Mets Thursday at Citi Field in a 16-1 rout.
Utley rapped out four hits in five at-bats (a double and three singles), and drove in four runs while Howard singled in a run as the Phills put up eight in the first inning, then polished off the Mets with his 14th homer of the year, a ninth-inning grand slam as the Phils added seven more runs.
Philadelphia has won three straight, leaving them four games behind St. Louis, winners of four in a row, for the second wild card. Also chasing the Cardinals are LA, Milwaukee and Pittsburgh.