Treadway had only 14 lifetime home runs in 591 at-bats entering the game and never more than one homer in a major league game. He is the first Atlanta player to hit three homers in one game since Ken Griffey did it on July 22, 1986.
The Braves scored five times in the third inning. Greg Olson led off with a walk, moved to second on Ron Gant's one-out single and Treadway followed with his third homer of the season. Jim Presley and David Justice added RBI singles in the inning.
In the fourth, Gant singled, stole second and scored on Presley's two-out double. The Braves added three runs in the fifth inning. Gant's fly ball scored a run and Treadway hit his second homer of the game. In the seventh, he hit a two-run homer.
The loss knocked the Phillies out of first place in the East.
The Phillies retired the jersey number of former third baseman Mike Schmidt before the game.
Houston 8-12, Chicago 1-3--Glenn Davis, who had only two hits in his previous 23 at-bats, hit three homers and drove in nine runs at Chicago.
The homers tied a club mark for a doubleheader set by Roman Mejias against the Milwaukee Braves on May 2, 1962.
In the opener, Davis had two homers and five RBIs. His bases-clearing double in the eighth inning of the second game combined with a homer to give him four RBIs.
Cincinnati 5, Montreal 3--Barry Larkin singled off reliever Tim Burke with the bases loaded in the ninth inning at Montreal to break a 3-3 tie give the Reds the victory.
The Reds have won 17 of 21 road games.
Pittsburgh 10, San Francisco 4--Wally Backman had three hits and drove in three runs and Doug Drabek won his sixth consecutive game at Pittsburgh as the Pirates moved into first place in the East.
Backman's two-run double keyed Pittsburgh's three-run second inning against Scott Garrelts (1-5).
New York 11, San Diego 0--Sid Fernandez pitched seven shutout innings and the Mets took advantage of bad fielding by shortstop Joey Cora at New York.
Mike Marshall walked with one out in the second inning, and Daryl Boston and Mackey Sasser followed with singles to load the bases. After Fernandez singled to score Marshall, two more runs scored when Gregg Jefferies' potential double-play grounder went through Cora's legs for an error. Fernandez scored the fourth run of the inning on a wild pitch.