Feldman allowed a run on three hits to produce a 1-1 tie. He also struck out two batters.
Feldman retired the first two Chicago batters before surrendering a single to Alex Rios and an RBI double to Adam Dunn, who was 1-for-10 against him lifetime before tonight.
Dayan Viciedo also singled, but Dunn held at third base for two reasons. Right fielder Nick Markakis has a plus-arm and Dunn has a piano on his back.
Feldman returned to the dugout after 22 pitches, including 13 for strikes.
Feldman is relying heavily on his cut-fastball and sinker in the first two innings.
The Orioles took a 1-0 lead against Chicago left-hander Hector Santiago on a leadoff walk to Nick Markakis and consecutive singles by Manny Machado and Adam Jones.
Meanwhile, Steve Johnson continues to make steady progress in his recovery from a strained left oblique.
Johnson was off today and will throw from 150 feet on Friday at the Ed Smith Stadium complex in Sarasota. That's the biggest increase in distance since he started a throwing progression program.
Johnson will either make 50 throws from 150 feet - 25, rest and 25 more - or 25 from 120 feet and 25 from 150.
Update: Chris Davis hit his 32nd home run to give the Orioles a 2-1 lead in the fourth inning.
Davis drove a 91 mph fastball into the seats in left field. Yes, another opposite-field home run, which may be the most impressive part of his transformation as a major league hitter.
The home run was measured at 352 feet. Not exactly a towering shot, but it cleared the fence and it counted. And again, Davis took a nice, easy swing. It doesn't take much effort.
Davis hit 33 home runs last season. He needs one more to tie his career high, and it's only July 3.
Update II: Gordon Beckham hit his first home run to tie the game 2-2 in the fifth inning.
The White Sox apparently will go to their bullpen after the sixth.
Feldman has allowed two runs and six hits in five innings, with no walks and five strikeouts. He's thrown 86 pitches, 52 for strikes.
Update III: Santiago made it through the seventh. Now I can safely say that he's done.
Feldman, in his Orioles debut, allowed two runs and six hits in six innings, with no walks, six strikeouts and one home run. He threw 98 pitches, 60 for strikes.
He's wearing Jake Arrieta's No. 34, but the similarity ends there.