LOS ANGELES — Michael "Big Mike" Lynche made Kara DioGuardi cry and turned the rest of the "American Idol" judges giddy with a moving performance of "This Woman's Work."

Lynche, a mountain of a guy who lives up to his nickname, performed last among the eight male semifinalists Wednesday and emerged as the star of the Fox TV show.

"You come out with an incredibly difficult song to sing, and you 100 percent nailed it," said Simon Cowell. "Not just the best performance of the night, it was the best performance of all these live shows so far."

The eight female semifinalists performed Tuesday, with the top six vote-getters from the men's and women's groups to be announced Thursday.

Lynche, 26, of Astoria, N.Y., moved impressively from a quiet falsetto start to a booming finale, but it was as much the story behind the song as his range that touched DioGuardi. Lynche's wife had a baby girl while he was in Los Angeles making the cut for "Idol."

"It's amazing. You were amazing," DioGuardi said. "It's your life right now, it's your respect for your wife, what you've gone through. ... It brought me to tears."

The other contestants, who may have been glad they didn't have to follow Lynche, picked up a mixture of praise and criticism.

Andrew Garcia, 24, Moreno Valley, Calif., had the roughest night, with his performance of "Genie in a Bottle" deemed pitchy by Jackson and dismissed by Cowell as "a little bit desperate."

Casey James, 27, of Fort Worth, Texas, did better with "You'll Think of Me," which Ellen DeGeneres and Cowell said sounded "great" but struck Jackson as a safe choice.

Tim Urban scored with his version of "Hallelujah," which is becoming an "American Idol" standard.