Tuesday’s sixth inning brought on one of the Mariners’ worst nightmares: a grimace on Felix Hernandez’s face. Hernandez said he felt a “pinch” in his lower back, which has bothered him on occasion this season, when he turned and threw to second. Shifting his weight from one side to the other while throwing to second gave him a shot of pain. After taking a warm-up pitch, Hernandez waved off manager Eric Wedge and trainer Rick Griffin to finish the sixth. But, that was it. Wedge wouldn’t let Hernandez back out for the seventh. “He said he was pretty sore still (Wednesday) morning,” Wedge said. “(But), he feels good.” Trainer Rick Griffin “felt like he got him in a good place … after the game and it’s going good (Wednesday), so we should be fine,” added Wedge, who said he doesn’t expect any change in routine or preparation for Hernandez. Hernandez was his usual bubbly self in the clubhouse on Wednesday and not interested in talking about his back. He said he’s “fine” when asked in passing. It will be something to watch over his next few starts.