Tests on Mets closer Billy Wagner's left shoulder showed he has muscle spasms around the joint.

Wagner was examined Monday and had a magnetic resonance imaging test Tuesday morning at the Hospital for Special Surgery after he felt tightness in his shoulder while warming up before the 10th inning Sunday in Cincinnati.

He was visited on the mound by manager Jerry Manuel and a trainer before striking out the side for his 24th save.

The left-hander hasn't picked up a ball since then, and while Wagner said he is "expecting to pitch," because of the nature of the injury he will test it in the bullpen before games this week.

"He'll throw a little bit before the game just to see how he feels," Mets manager Jerry Manuel said. "Then at some point during the course of the game (coach) Dan (Warthen) will call down and let me know what his status is. At that point we'll make a decision, one way or another."

Wagner wasn't sure if he ever had an injury like this before. "They have so many different words for it I don't know," he said as reliever Scott Schoeneweis held up a hand-written sign reading "OLD" behind him.

ETC. The Astros acquired pitcher Randy Wolf from the Padres for minor leaguer Chad Reineke. Wolf is 6-10 with a 4.74 ERA in 21 starts for the Padres this season. . . . The Diamondbacks acquired reliever Jon Rauch from the Nationals for second baseman Emilio Bonaficio. Rauch was 4-2 with 17 saves in 22 chances and a 2.98 ERA for the Nationals. . . . Nationals shortstop Cristian Guzman agreed to terms on a two-year, $16 million contract extension that takes him through the 2010 season. "I took this deal because I want to stay here," said Guzman. . . . Nationals outfielder Wily Mo Pena has had surgery on his left shoulder and will miss the remainder of the season. . . . The Cardinals placed Chris Duncan on the 15-day disabled list with a bulging disc in his neck. . . . Braves manager Bobby Cox sat out Tuesday night against Florida to serve the one-game suspension he earned with a tirade on Sunday. . . . Royals pitcher Jimmy Gobble, who allowed 10 runs in one inning Monday against Detroit, was placed on the 15-day disabled list Tuesday with a stiff lower back.