"I went back to basics," said Baldwin now 5-2 in nine starts since returning to the rotation. "Being out there that long gives you time to think about what you need to do."
Ken Griffey Jr., who hit his 42nd home run Saturday, went 0-for-4 as Seattle lost for the fourth time in the last five games.
"It wasn't a fun day out there," said Seattle's Alex Rodriguez.
Durham hit his 14th homer a two-run shot and a tie-breaking RBI single as the White Sox won for the eighth time in 12 games.
Before the game, White Sox manager Jerry Manuel announced that Navarro, who has been strictly a starter since 1995, will switch to the bullpen for the rest of the season.
"Navarro's been in the game for a long time," said Baldwin who gave up three runs on four hits, striking out six. "All he has to do is keep his head up and get down on his knees every once in a while and pray."
"You have to send a message that these things aren't guaranteed for life," Manuel said. "He (Navarro) didn't balk or fight it. In the back of his mind, I think he welcomed the change."
The White Sox, now 20-15 since the All-Star break, changed their luck in the seventh. With the game tied 3-3, Chad Kreuter led off with a double against Jeff Fassero (10-9). Durham then singled to center to score pinch-runner Mike Cameron. The White Sox added their final run in the eighth on an RBI single by Magglio Ordonez.
"I've been seeing the ball well," Durham said. "I just wanted to put it in play."
Fassero lost for only the second time in his last 10 starts. He allowed all five runs on 13 hits in pitching his sixth complete game of the season.
"They didn't overpower us, they just hit the ball," Fassero said. "They did it the whole series. All they did was base hit, base hit, base hit."
"The White Sox swung the bats well the whole series," Mariners manager Lou Piniella said. "Even in the loss (Saturday), they had 17 hits."
Keith Foulke (3-1) pitched an inning of one-hit relief to earn the victory. Bob Howry worked the eighth and Bill Simas struck out the side in the ninth for his 15th save.
Joey Cora tripled to lead off the Mariners first and scored on Rodriguez's single.
Durham homered with two out in the third, scoring Ordonez who had doubled, to give Chicago a 2-1 lead. Wil Cordero's RBI groundout in the sixth scored Albert Belle to make it 3-1.
The Mariners chased Baldwin in the seventh when Jay Buher hit a two-run homer, his 12th, to tie the game at 3.
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