Bailey Falter pitched well, but the Phillies failed to capitalize with runners in scoring position and dropped the series finale with Texas at Globe Life Park on Sunday night, 2-1.
The Phillies finished 1-for-8 with runners in scoring position.
Falter tossed 5 1/3 frames, surrendering two runs on seven hits. He didn't walk a batter and whiffed three.
Josh Harrison evened things for the Phillies in the fourth, pushing Nick Castellanos across the plate on a double play.
The Rangers answered in the fifth with Marcus Semien hitting an RBI single to right field, allowing Mitch Garver to score the eventual winning run.
Trea Turner finished 2-for-4 in the contest with a double. Edmundo Sosa and Bryson Stott also chipped in with two hits each in the loss.
The Phillies will open a three-game set in New York with the Yankees on Monday night.