PHOENIX (AP) - Shawn Marcum felt a little tightness in his right shoulder on Thursday, and decided to call it a day.

No need to push it - especially when you're pitching for the Milwaukee Brewers this spring.

Marcum pitched three solid innings in a 4-0 victory over a Chicago White Sox split-squad before departing because his shoulder just didn't feel right.

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``If it were the regular season, especially August, September, I'd pitch through it and wouldn't say a word,' he said.

Marcum threw two perfect innings and allowed only Alexei Ramirez's leadoff single in the third. He said his shoulder started to tighten up between the second and third innings, akin to tightening he has felt both earlier this spring and in the past.

``Some days it feels tight, some days it feels OK,' he said. ``After the third we decided it was in my best interest not to go back out there. I didn't want to push it and do something stupid.'

Milwaukee already is without right-hander Zack Greinke, who fractured a rib playing pickup basketball, and Manny Parra, who has been slowed by muscle tightness in his back.

``Geez, we're in a tough spot if he's down for a while,' Brewers manager Ron Roenicke said. ``There's definitely a concern there.'

Other ailing Brewers include Rickie Weeks (hamstring), Ryan Braun (strained rib cage muscle) and Corey Hart (left oblique).

Milwaukee did get Carlos Gomez back on Thursday. The speedy center fielder, who had been out with a sore back, went 2 for 2 with a double and scored a run.

White Sox starter Edwin Jackson allowed four runs in the first, then pitched shutout ball for the next four innings. He gave up nine hits, struck out seven and walked none.

``It's always good when you have an outing with no walks,' Jackson said. ``It means you at least were challenging the hitters and making them put the ball in play. I'll take my chances when they have to put the ball in play.'

NOTES: Braun, who ran into a wall during batting practice on Saturday, got the day off after returning to the lineup Wednesday night. ... Brewers OF Chris Dickerson also got the day off after colliding with San Francisco's Pedro Alvarez on Monday. ... Brewers closer John Axford pitched a scoreless fifth inning. ``He said he was going to try and come out with a different attitude than he thinks he had,' Roenicke said. ... Jackson singled in the fifth, one of Chicago's five hits, and said manager Ozzie Guillen told him he was happy he survived injury-free. ... Guillen's lineup featured every regular except Paul Konerko.