PHOENIX -- Chicago's Wilson Betemit gave David Riske a rude welcome back to the big leagues.

Riske pitched the fifth inning against the White Sox on Wednesday, his first game since undergoing right elbow surgery last September. His first pitch was a fastball low in the zone to Betemit, and it was launched into the Sox bullpen for a home run that tied the game at 1.

Riske allowed one more hit, but escaped further damage in the Brewers' eventual 6-2 loss. He expects to take the next two days off before appearing again on Saturday against the Dodgers.

"It was great, other than getting ambushed," Riske said with a smile. Referring to Betemit, he added: "It was probably Ozzie [Guillen, the Sox manager] telling him, 'Hey, swing as hard as you can at the first pitch, because you know he's going to throw a strike.'"

That was precisely what Riske was trying to do. He's been on a strict throwing program this spring after undergoing surgery on Sept. 23 to remove a bone spur from his right elbow.

The spur had been there all year and actually started bothering Riske in mid-March, when he was working extensively on a slider. He was 1-2 with a 5.31 ERA in 45 regular-season appearances before the Brewers shut him down. It was a frustrating start to a three-year, $13 million contract.

Riske was happy with Wednesday's outing, other than that home run.

"It's like, 'Put him up there again so I can face him again right away,'" Riske said. "I'm very competitive, so it's kind of hard to take ... but I'm very pleased with how I kept the ball down. It's a big difference to have the elbow feeling good."