Gustavo Kuerten reached the third round for the first time in eight tries after a controversial win over Ivan Ljubicic.
The former world number one led by two sets to one when Ljubicic was upset by a line call and totally lost his form.
After falling 4-0 down in the fourth set, Ljubicic delayed proceedings with an injury time-out, and Kuerten had to re-focus to win 7-5 6-7 (5/7) 6-4 6-3.
"It was a great day," said Kuerten. "It gives me a lot of hopes and beliefs for the next round."
Kuerten will face 13th seed Paradorn Srichaphan next after the Thai also reached the third round for the first time in comfortable fashion.
He was leading Jerome Golmard when the Frenchman sufferd a hamstring injury and retired.
"Right now, it's difficult for me to walk, so I think it's going to be bad," he said afterwards.
Ninth seed Sebastien Grosjean continued his steady progress with a 6-4 6-3 6-2 win over Jan-Michael Gambill.
Grosjean will now play the in-form Dominik Hrbaty, who beat Argentina's Gaston Gaudio 6-1 7-5 6-0.
Hrbaty has already won two tournaments in 2004 and has now won 12 straight matches.
Robin Soderling, conqueror of sixth seed Rainer Schuettler in round one, saw his run come to an end at the hands of Nicolas Escude.
Escude had six months off the tour after Wimbledon last year through injury, but returned to win a tournament two weeks ago.
He beat Soderling 6-3 7-6 (7/4) 6-4 and could be a dangerous floater in the top half of the draw.
Also through is James Blake, who beat Nicolas Lapentti, and veteran Todd Martin, who beat Ivo Karlovic in three tie-break sets.
Martin will play former world number one Marat Safin in round three after the Russian beat Jarkko Nieminen 7-6 6-4 4-6 6-4.
Safin, who has slumped to 86 in the rankings after an injury-plagued 2003, has vowed to control his temper as he looks to get back to his best.
But that proved difficult in the third set as Nieminen fought back, with Safin earning a code violation for smashing his racket.
"I just got a little bit tired and had problems with my legs," said Safin.
"I started to get annoyed by that because I didn't want to play four sets. I didn't want to get in trouble for the fifth."
Sixteenth seed Sjeng Schalken needed four sets to beat David Ferrer, eventually winning 6-3 6-2 5-7 6-1.
American Robby Ginepri, seeded 32nd, won the final match of the day, seeing off
Australian youngster Chris Guccione 6-4 6-3 6-3.