The Nationals will place starting pitcher Dan Haren on the 15-day disabled list with a right shoulder injury, manager Davey Johnson announced on Sunday.
Haren had experienced tightness in his shoulder during his previous two starts, having trouble getting his arm loosened up.
"I’m not really concerned about it, but they wanted me to take some time to get 100%," he said. "I definitely don’t want to use this as an excuse for the first three months of the season. That was more due to lack of execution, instead of an injury."
Johnson said it was a tough decision for he and general manager Mike Rizzo to make.
"He wasn’t particularly pleased to go on the disabled list, but he knew it was probably the best thing," Johnson said.
“The last two times he had trouble getting loose. And that could be a sign of a tired arm or whatever. We’re not going to take any chances, we’re just going to let him get healthy and finish up the way he did last year.
Haren heads to the DL one day after allowing six earned runs in a blowout loss to the Rockies. His ERA shot up to 6.15, worst in the majors, as his overall nightmare of a season continued.
Nationals pitching coach Steve McCatty said on Sunday morning the team had concerns with Haren's pitching mechanics. He believed injuries to his hip and back from the season before had altered his release and arm slot. He acknowledged a possibility those new mechanics may have contributed to a new injury.
Haren will have an MRI to determine if anything serious is the matter, for now it is not expected to affect him longterm.
Werth leaves game with groin injury
Jayson Werth left Sunday's game against the Rockies after pulling his left groin muscle while tracking a Michael Cuddyer single in the third inning.
After suffering the injury, Werth stayed in the game and recorded a single in the fourth. But as he ran to first base, he felt pain in his groin and was replaced by Roger Bernadina.
Werth does not believe a trip to the disabled list is necessary at this point.
"I hope not," he said. "I don’t know entirely but I think it’s a situation where I’ve been kind of sick the last couple of days, haven’t really eaten a whole lot, probably pretty dehydrated. It started out as more of a cramp, but I stayed in the game and felt a little bit worse than a cramp."
Werth missed Saturday's game with flu-like symptoms and said in hindsight he should not have played on Sunday. He doesn't expect to have an MRI on the groin and hopes to play on Tuesday.
"I think we’ll know more tomorrow," Werth said. "Right now I don’t feel too bad. I feel a lot better than I did when I came out. But I’ve had a bag of fluids and I finally got something to eat, that was good. I haven’t really been able to eat a whole lot, so it’s one of those things."