Update (12:50 a.m.): Hey, guess what -- Jake Peavy was in pain before he made his start!

Peavy said felt the pain last day in Oakland. Saw a doctor Monday — Scott Merkin (@scottmerkin) June 5, 2013

Peavy very dejected postgame. Looking forward to this start against/with Felix. Is fairly certain he won't make next start Sun vs. Oakland — Scott Merkin (@scottmerkin) June 5, 2013

Peavy described the injury as higher up on his left side, above his diaphragm. Will know more after 10:30 a.m. PT MRI — Scott Merkin (@scottmerkin) June 5, 2013

Mind you, this is the guy with the highest trade value on the Sox.

Update (11:11 p.m.): The White Sox say Jake Peavy left tonight's start with rib pain. X-rays were negative, but he will undergo an MRI Wednesday morning.

Jake Peavy did not look like his usual self during a rough start to tonight's ballgame against the Seattle Mariners.

His radar gun readings certainly looked off. Peavy usually averages 91 with his fastball, but he could only top out at 90, hitting that mark four times in the first, zero times in the second, and twice in the third according to MLB.com's Gameday.

More than that, Peavy looked uncomfortable physically. CSN Chicago cameras caught a telling moment during the top of the third, which Hawk Harrelson interpreted as a pectoral muscle issue:

He appeared to tell Adam Dunn and then Tyler Flowers, but it's hard to say if his bosses received a status update. Nobody got up in the bullpen, and Peavy was allowed to start the third.

He didn't finish it. He gave up a single, a well-hit flyout, a ground-rule double, and a roped double to Raul Ibanez (on a plate-splitting 90-mph fastball on a 3-1 count) before Robin Ventura visited the mound. Herm Schneider came out a minute later, and Peavy was done.

His final line: 2⅓ IP, 7 H, 6 R, 6 ER, 0 BB, 0 K, 1 HR, 32 of 42 pitches were strikes.

Maybe Ventura didn't need to get anybody warm, because the injury allowed Brian Omogrosso to take all the time he needed. But given the bizarre handling of Peavy's injuries in past seasons, you can't really assume any party involved will act judiciously.