Halladay (11-4, 4.15 ERA) bested Buehrle (7-6, 3.23) as Toronto won 2-0 on May 31. Buehrle threw a complete game and allowed only two hits, but they were solo homers by former Chicago slugger Frank Thomas and Aaron Hill.
Halladay, meanwhile, scattered six hits over seven innings and struck out seven in a game that lasted just one hour, 50 minutes. He improved to 2-2 with a 3.08 ERA in seven career starts against the White Sox (47-56).
The right-hander is coming off his best outing of the season, tossing a three-hitter in an 8-0 victory over Seattle on Sunday. It was his ninth career shutout and first since May 29, 2005.
“A lot of things went my way,” Halladay said. “For the most part I was getting the ball where I wanted to and when I didn’t, it seemed to go right at guys. It’s nice to have that combination.”
Halladay hasn’t been dominant on the road this season, going 4-3 with a 5.25 ERA in nine outings.
Buehrle has pitched very well this year, but his last outing was his worst of 2007. He was pounded for season highs of seven runs and 14 hits in a 9-6 loss to Detroit on Monday.
He left the team to join his wife, Jamie, who gave birth to the couple’s first child, Braden, early Thursday morning.
“Obviously, family is more important than baseball,” Buehrle said before leaving. “This is time where I need to be home now.”
The left-hander is 2-2 with a 3.52 ERA against the Blue Jays (51-51) in nine appearances - eight starts.
Toronto center fielder Vernon Wells is 11-for-23 (.478) in his career against Buehrle.
It was the first game for the White Sox since they traded second baseman Tadahito Iguchi to Philadelphia for minor league reliever Michael Dubee earlier in the day. Chicago will purchase the contract of Danny Richar from Triple-A Charlotte on Saturday, and he’ll become the regular second baseman.
“I wanted to make sure that we had a good read on what we had on Danny Richar before September, before the offseason came around,” Chicago general manager Kenny Williams told the team’s official Web site. “I wanted to make sure they have adequately answered some questions before going into the offseason.”
Chicago first baseman Paul Konerko is expected back in the lineup Saturday after getting Friday off. Konerko is mired in a 9-for-50 slump (.180) over his last 13 games.
The Blue Jays had their five-game winning streak snapped after blowing a 3-1 lead. They wasted Reed Johnson’s 4-for-5 night as he was stranded all four times.
Toronto All-Star right fielder Alex Rios went 1-for-3 and is hitting .417 (15-for-36) over his last nine games.