Since coming off the disabled list early this month, left-hander Brian Matusz hasn't looked like the pitcher that stormed through the minors two years ago and gave Orioles' fans so much hope for the future.

That optimism has been replaced by a deflating combination of disappointment and consternation, feelings compounded Saturday in the Orioles' 10-5 drubbing by the Cincinnati Reds.

"This is a (24)-year old young man that has had some success in just about everything he's done pitching and finished up pretty good last year and he's had a lot of challenges health-wise this year for the first time in his career," said Orioles manager Buck Showalter. "So I try to keep that in mind. Obviously, it affects you physically, but sometimes mentally. He's strong enough. He'll fight through it and be better as a result of it."

With Matusz unable to find consistency Saturday, the Orioles (34-40) returned to a season-worst six games under .500, while the Reds (40-38) won for just the third time in their last eight games.

The announced crowd of 38,976 witnessed a nine-homer night, tying for the second most home runs hit in one game in Camden Yards history. It was the first time this season that opposing teams have homered at least four times in a game. Only one run on Saturday did not come courtesy of the longball.

The Reds homered five times, including three off Matusz, who has now yielded seven in his last 13 1/3 innings. This from a pitcher who allowed just six home runs in 44 2/3 big-league innings as a rookie in 2009.

"It's a matter of being able to make better pitches at better times," said Matusz (1-3). "You can't let the big hitters hurt you and that's what I've done."