By Piers Newbery
BBC Sport at Wimbledon
A fiery Lleyton Hewitt moved into the quarter-finals with a four-set win over American Taylor Dent.
The third seed got a code violation for verbal abuse in the second set as Dent put the pressure on after a poor start.
Dent missed a vital break point chance when he inexplicably left a ball that dropped in, but then saved two match points in the third set tie-break.
An edgy Hewitt needed two breaks of serve in the fourth set before finally edging home 6-4 6-4 6-7 (7-9) 6-3.
"He started a little tentative with two double faults in his first game, but when you get those half chances you really have to take them," said Hewitt.
"Playing a guy like Taylor I felt like the first set was going to be pretty huge. I felt like I went up a notch or two when I needed to."
And Hewitt admitted that he felt there had been an unusual amount of overrules.
"Everyone's human and you're going to make mistakes. It's very hard for any chair umpire to overrule on the far side of the court."
He added: "Taylor questioned calls as well. There are a lot of calls you don't question."
Hewitt next plays Feliciano Lopez, who gave further evidence of his title credentials with a superb straight-sets win over Mario Ancic.
The Spaniard, who beat Marat Safin in round three, saw off the 10th seed 6-4 6-4 6-2 on Court Two.
Ancic, who was many people's outsider for the tournament, had a poor day and received a code violation early in the second set for smashing his racket.
The Croat made 15 double faults as Lopez broke his usually fearsome serve five times.
"It was quite an easy match," said Lopez. "Mario did not play good today, he was a little nervous and didn't serve as well as usual. It happens sometimes.
"For me it was a great match - I'm serving and volleying good. I just want to focus on my next match.
"It's easy to dream but I just want to play the next round as well as I played today and get to the semis."