While Delic made 29 unforced errors, Canas committed just seven. In three matches this week, Canas has made 35 unforced errors in six sets compared to 95 for his foes. Canas also has won 78 percent (40-for-51) of his total service points.
"I do try to dominate unforced errors," Canas said. "But I think today I started to get better with my serve. I think all this week I've been serving very well, but my serve has been getting better and better with each match."
Canas is playing only his second tournament of the year after being sidelined because of left wrist tendinitis. He will face Sam Querrey, a 7-5, 6-2 winner over France's Julien Benneteau in the last quarterfinal Friday night.
"Today really was the best day to play because the weather was incredible; no wind, sunny, warm," Canas said. "It's great to play in those conditions. With that, I got very comfortable with my game. Game by game, match by match I feel more confident."
Another qualifier, Kevin Anderson, beat Evgeny Korolev, 6-2, 6-0, in 53 minutes.
Ginepri, who has made three semifinals in 2008, won 89 percent (24-for-27) of first-serve points. He's 9-2 this season.
Anderson had never advanced beyond the first round before this week. But he dominated his first quarterfinal appearance, outdoing Korolev in aces 8-2, total service points won at 81 percent (30-for-37), break points won at 63 percent (5-for-8) and first-serve points won at 80 percent (20-for-25).
"I think I took every opportunity given," Anderson said. "That was the key to the match. "I was able to make a lot more returns today [as opposed to playing against the 6-foot-9 John Isner on Thursday]. I was more aggressive with my serve, which I like to do, and I thought I did that pretty well, especially as the match went on."
The 6-1 Korolev, from Russia, made the semifinals last year in Las Vegas. He eliminated top-seeded Fernando Gonzalez in the second round.
The 20-year-old Querrey held serve throughout the match to advance to his second semifinal of the year. "Everything I did tonight worked," Querrey said. "I was going for a little more and it paid off."
Querrey knows beating the consistent Canas will be no easy task.
"What does he make one unforced error a game?" Querrey asked, joking. "I'll have to play good, play perfect tomorrow to win."