Frazier did pinch-hit in the eighth inning on Friday and delivered a clutch game-tying RBI double to left field.
"I was swinging in the cages and the right side and middle muscles just tightened up. I couldn't really move," Frazier said on Saturday. "They worked on me. I give thanks to the training staff and everybody there that really helped me out. It feels a lot better today. I worked on it just now and I'm going to go swing. I feel good."
The Reds went on to beat Detroit in 10 innings Friday by a 6-5 score.
"I didn't feel it when I was swinging yesterday. The adrenaline was going," Frazier said. "I woke up today a little nervous, but I didn't feel anything. I was just a little sore. I'd rather have sore than pain. That's doable."