Colon strained his left groin while doing flat-ground work Friday, which prompted trainer Nick Paparesta to halt the throwing session. The veteran still felt sore Saturday, forcing the decision.
The right-hander has been excellent for Oakland this season, going 14-5 with a 2.97 ERA. Colon, however, has struggled in his past two starts, surrendering 10 runs over 6 2/3 innings while seeing his velocity decrease.
Considering Colon's recent struggles, a break may not be the worst option for the starter. Athletics manager Bob Melvin discussed the issue, stating:
"He certainly doesn't want to (rest), he wants to make every start he can. Based on the fact he's had a great season for us and he's a guy we've leaned on pretty hard and has 14 wins to this point, it's not easy. You always want him to be able to pitch, but maybe with his age and so forth, a little breat at this point in time might be good for him."