Vogelsong allowed four runs on seven hits and three walks in 4 2-3 innings Saturday.
Analysis: Vogelsong, who twice beat the Cardinals during the Giants' 2012 postseason run to the World Series championship, failed to reach five innings for the second straight start. The right-hander had been 2-0 with a 2.70 ERA over his previous three starts at AT&T Park.
Lynn still wound up with his first career win over the Giants, sending the NL Central-leading Cardinals to a 6-0 victory Saturday despite getting hurt.
Analysis: Lynn awkwardly came off the mound to field Juan Perez's leadoff chopper in the eighth and twisted his ankle trying to throw to first. That was Lynn's final batter, and he'll be reevaluated Sunday.
Koehler is still seeking his first win since July 23 after losing Saturday.
Analysis: Koehler allowed five runs and nine hits over six innings in losing his seventh straight. "I feel like I'm running out there and throwing the ball well," he said. "I find a way to just kind of let the guys down at a certain point. That's the part that gets me."
Analysis: Morgan recovered from the worst outing of his young career by surrendering six hits with three strikeouts and no walks. He gave up two runs, but neither was earned. Morgan, who debuted on June 21, allowed five runs - including four homers - in 3 2-3 innings on Monday in a 16-7 loss to the Mets.