Cal Stevenson delivered a go-ahead two-run double in the seventh and then robbed a home run in the eighth as the host Philadelphia Phillies notched a 6-4 win over the New York Mets on Saturday.Bryce Harper hit two home runs for Philadelphia (89-59), which moved eight games ahead of New York (81-67) in the National League East standings.The Phillies and Mets conclude their three-game series with the rubber match Sunday before reuniting for a four-game set in New York next weekend.Starling Marte drove in three runs for the Mets, who had won 12 of their previous 14 games. Luisangel Acuna, the brother of Braves star Ronald Acuna, made his major league debut for New York and went 2-for-4.The Phillies trailed 4-0 early before Harper began to chip away. His 27th homer — and his first since Aug. 9 — made it a 4-1 game in the fourth before he added a two-run shot in the sixth — his 150th home run as a Phillie — to get the hosts within 4-3.Both home runs came off Mets starter Luis Severino, who was charged with three runs in six innings. He allowed three hits and a walk with five strikeouts.