(Joe Robbins/GETTY IMAGES)

In the sixth inning, Tracy drove in the go-ahead run with a pinch-hit double. As he ran to second, he started hobbling and grabbed the right side of his groin. Tracy and the Nationals are hopeful he merely broke up scar tissue from a double sports hernia operation he underwent in November.

“I’m pretty sore right now,” Tracy said. “We’ll see what happens tomorrow. I’m not quite sure. It could be a couple different things.”

Tracy spoke to the doctor who performed the surgery, and he suggested that it’s possible the scar tissue had popped as opposed the muscle tearing again. Tracy had experienced anything similar since the surgery.

Tracy, 32, signed a minor league contract this winter and was one of the last Nationals to make their roster out spring training. He has been one of the most effective pinch hitters in the majors, going 6 for 18 with a home run, a double, three walks and nine RBI, most in the majors.

“He’s so valuable, I hate to overreact and make a roster move when maybe he’s going to be alright in two or three days,” Johnson said. “He’s a weapon.”