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TEX@MIN: Grimm tosses seven scoreless against Twins

The forecast is calling for unseasonably cool temperatures, as well as a chance of rain, for Thursday night's series finale between the Rangers and White Sox in Arlington. That could present a challenge for Texas pitcher Justin Grimm, but so far the rookie hasn't let anything bother him this season.

The Rangers put the right-hander in their rotation to replace the injured Matt Harrison, and he has gone 2-0 with a 1.59 ERA in three starts. Grimm has yet to allow more than two runs in an outing and he's holding opponents to a .239 average, including 1-for-19 with runners in scoring position.

The 24-year-old authored his best outing on Friday at Minnesota, tossing seven scoreless innings against the Twins, allowing five hits and no walks. Manager Ron Washington called the effort "outstanding" and praised Grimm for his ability to keep the ball down and move it around the zone.

"The name of the game is trusting my stuff," Grimm said. "It's not just the stuff, it's just a mindset. It's not trying for the strikeout or trying to do too much but just trusting my stuff out there."

Grimm will take on 25-year-old left-hander Hector Santiago, who will try to lead the White Sox to a series victory following their win on Wednesday night. That snapped a three-game losing streak for Chicago.

Santiago, who was scheduled to make his first start of the season Friday night in Kansas City, was named Thursday afternoon to replace Jake Peavy, who was scratched because of back spasms. Santiago still will be pitching on sufficient rest after throwing 86 pitches in relief of Gavin Floyd last Saturday night at home against the Rays.

Santiago posted a 2-0 record with a 1.86 ERA over four starts last season.

He could find himself matched up against former teammate A.J. Pierzynski, who is expected to return to the Rangers' lineup after missing two games with a strained oblique muscle in his right rib cage. Pierzynski, who was hit by a pitch during a ninth-inning appearance as a pinch-hitter on Wednesday, played for the White Sox from 2005-12.

White Sox: Omogrosso added to bullpen
• Right-hander Brian Omogrosso was recalled from Triple-A Charlotte on Wednesday when lefty Donnie Veal was optioned there. That makes Matt Thornton the only southpaw among Chicago relievers.

Omogrosso made 17 relief appearances for the White Sox last season and posted a 2.57 ERA. His ERA with Charlotte this year is 6.52, thanks to two rough appearances, in which he has gave up all nine of his runs. The 29-year-old has held the opposition scoreless in his other five games.

• Manager Robin Ventura plans to give outfielder Casper Wells his first start on Thursday. The White Sox acquired Wells from the A's on Monday, making them his fourth organization this year.

Rangers: Weather could bench Berkman
• The Rangers have been cautious about using designated hitter Lance Berkman in bad weather, which could lead the club to hold the veteran out of the lineup on Thursday.

"I'll just wait and check with Berkman," Washington said. "If he wants to go, I'll let him go. If not, I'll take him out. The one thing we've accomplished since he's been here is honesty. He has been forthright about when he can play and when he can't."

• Murphy is expected to get the start in left field after being on the bench the past two games with left-handed pitchers on the mound. Murphy, hitting .174 this season, took early batting practice on Wednesday.

Worth noting

• Grimm threw three relief innings against the White Sox last July 3 in Chicago, giving up three runs on three hits and striking out three.

• The Rangers are the lone Major League team that is unbeaten (5-0-3) in series play.

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