(CNN) -- Lleyton Hewitt continued his fine run in the ATP tournament in Memphis by beating fellow-Australian Chris Guccione to reach the quarterfinals as his comeback gathers pace.
Hewitt eased past Guccione to earn a quarterfinal berth against Rochus in Memphis.
The former world number one upset third seed James Blake in the previous round and again impressed with a 6-2 7-6 win to earn a last eight clash with Belgian Christophe Rochus, a surprise 6-2 6-4 winner over seventh seed Mardy Fish.
Hewitt, making his second quarterfinal of the season after hip surgery last August, was always expecting a tough battle against Guccione.
"We know each other's game very well since we've practised a lot in Davis Cup and at tournaments. I got off to a good start and played well the rest of the way," he told the offical ATP Tour Web site.
Top seeds Andy Roddick and Juan Martin Del Porto also made it safely through with straight sets victories on Thursday night.
Top-ranked Roddick needed just over an hour to beat fellow American Robby Ginepri 6-2 6-3, while Del Potro saw off Latvian Ernests Gulbis, 6-3 6-4.
San Jose winner Radek Stepanek of the Czech Republic is looming large after easing past Austrian Stefan Koubek 6-2 6-4 to earn a crunch clash with Del Potro.
"He's playing very good and he has a lot of confidence but I think I could beat him if I play my game," said Del Potro, who will meet Stepanek for the first time.
In the women's WTA event being run jointly in Memphis, top-seed Caroline Wozniacki of Denmark needed three sets beat Dutch qualifier Michaella Krajicek in three sets to reach the semifinals.
She will play Britain's Anna Keothavong who advanced with a 6-2 1-6 6-2 victory over fifth seed Marina Erakovic of New Zealand.