"It's been a little sore the last couple days and I think it got a little worse," Sucre said after being replaced by veteran John Baker for the final three frames. "I was feeling pain the last couple innings. I got a little scared and finally told the skip and that was it."
Sucre is hitting just .100 (2-for-20) in 10 games this spring, but he is regarded as an excellent defensive catcher and threw out another baserunner Sunday when he nailed Leonys Martin in the second inning.
Sucre seems to have the upper hand in the battle for the backup job to Mike Zunino, with Baker also still in the hunt as a nonroster invitee on a Minor League deal.
With two weeks of Spring Training remaining, Sucre doesn't want to take any chances now.
"I was feeling it when I was catching and trying to throw the ball to second," he said. "It was getting worse over the innings. I'm one of those guys that knows how to play with soreness, but I think it's better to work it out right now. I might just need a few days. We'll see."
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.