CLEVELAND -- Philip Humber has gone from perfect to perfectly flawed.
Humber couldn't get out of the third inning Monday as the Cleveland Indians pounded the right-hander, who threw a perfect game April 21, in an 8-6 win over the Chicago White Sox in the first game of a day-night doubleheader.
At night, Shelley Duncan's RBI double in the eighth inning gave the Indians a soggy 3-2 win and a sweep of the twin-bill. Duncan ripped a pitch from left-hander Matt Thornton (1-2) into the left-field corner, scoring Asdrubal Cabrera
In the daytime opener, Zach McAllister, recalled from Triple-A Columbus before the game, allowed just two earned runs and six hits in six innings for his first career win.
Humber (1-2) hasn't been sharp since pitching the 21st perfect game -- and one of the most surprising -- in major league history last month. Since then, Humber has allowed 20 runs in 13 1/3 innings and gone 0-2 with a no-decision.
"I'm frustrated," said Humber, tagged for eight runs and nine hits in 2 1/3 innings. "I'm doing my best, it's just the last two or three times out there, it's been rough. I'm definitely hoping for better results. I'm doing the best I can to make that happen, but right now it's kind of a grind."
Michael Brantley and Casey Kotchman drove in three runs each for the AL-Central leading Indians, five games over. 500 for the first time this season. Travis Hafner homered and hit his first triple in nearly five years as Cleveland, coming off a series win over defending AL champion Texas, improved to 7-3 in its last 10.
Alexei Ramirez had three RBIs for the White Sox, who closed within 8-6 in the ninth against Jairo Asencio before Nick Hagadone got three outs for his first career save.
Humber's masterpiece last month was stunning. There were few signs the 29-year-old, who went 9-9 last season, would deliver a performance worthy of any record books. But he threw the third perfect game in club history in Seattle in just his 30th major league start.
His recent slide, which has come after his wife gave birth to the couple's first child, has been almost as unexpected.
In his last three outings, Humber has given up 21 hits, including five homers, and walked 11.
"Today I did not feel like I had very good stuff at all," Humber said. "The ball wasn't coming out of my hand very good. It's not a health issue or anything like that. I'm not getting down on myself. I don't have any less confidence than I had coming into the season.
"I know I have what it takes to pitch well. It's a matter of getting it to happen. I've had a couple of good games, one decent one and two terrible ones."
The Indians chased him with a five-run fifth.
After Humber allowed two singles and a walk to load the bases, Brantley's two-run double made it 5-2 and Kotchman, batting just .160, followed by lining a shot into the gap in right-center. Kotchman managed to leg out a two-run double when shortstop Ramirez missed the tag at second.