BRADENTON, Fla. - NL Rookie of the Year Jason Bay will miss at least a week after he jammed his left wrist diving for a flyball in the fifth inning of the Pittsburgh Pirates' 10-4 loss to the Cincinnati Reds on Tuesday.

Bay was injured when he attempted to make a diving catch on Adam Dunn's drive near the left-field line. He immediately clutched his wrist and was removed after manager Lloyd McClendon conferred with trainer Brad Henderson.

He was taken to Manatee Memorial Hospital, where X-rays and an MRI showed Bay had bone bruise in his left wrist. He is week to week but should be ready for opening day, team spokesman Jim Trdinich said.

"I think Jason was scared more than anything," McClendon said. "When we were coming in, he didn't say anything bad at all. He wanted to stay in the game, but at this point you want to make sure everything is OK."