AAPT Championships, Adelaide
Fifth seed Taylor Dent remains on course for the fifth title of his career following a straight-sets win over Slovakia's Karol Beck.
The American won 7-6 (8/6) 7-5, and goes on to face Thomas Johansson in the last eight.
Big-serving Dent won three titles in the second half of last year, marking him out as a player to watch in 2004.
The 23-year-old also changed coaches and is now working with his father, former Wimbledon semi-finalist, Phil.
Alberto Martin was another high profile second-round casualty, the seventh seeded Spaniard going down in straight sets 6-2 6-3 to Slovakia's Dominik Hrbaty.
Sixth seed Jarkko Nieminen beat Italy's Davide Sanguinetti, the Finn coming through, after a first set tie-break, 7-6 (7/2) 6-4.
Second seed Vince Spadea ended the hopes of local favourite Wayne Arthurs with a 6-4 6-7 (8/10) 6-3 victory.
However, the home fans found consolation and something to cheer when wildcard Todd Reid beat Raemon Sluiter of the Netherlands 6-3 6-2.
Britain's Greg Rusedski went down 6-2 6-2 to France's Cyril Saulnier.
Qatar Open, Doha
Sebastien Grosjean became the latest seed to lose in Doha when he came unstuck against Ivan Ljubicic in the quarter-finals.
The tall Croat powered to an victory against the out of sorts fourth seed, winning 6-3 5-7 6-4.
Grosjean clawed his way back into the match in the second set after Ljubicic's fast start, but the speedy Frenchman's failure to hold serve in the ninth game of the deciding set proved his downfall.
"I am very pleased with the way I played. I concentrated on serving well," Ljubicic said.
Ljubicic now faces seventh seed Tim Henman, who cruised past Armenia's Sargis Sargsian 6-3 6-1.
The other semi-final will be contested between Agustin Calleri and Nicolas Escude.
After his heroics against world number one Andy Roddick, Jonas Bjorkman could not get the better of eighth seed Calleri.
The Argentine, ranked number 24 in the world, booked his last four spot with a 6-4 6-4 win.
Escude beat South Korea's Lee Hyung-Taik 6-4 6-2.
Tata Open, Chennai
Spain's Carlos Moya was made to work hard for a place in the quarter-finals against American Paul Goldstein.
The top seed saved a match-point in the second set tie break before running out a 3-6 7-6 (9/7) 6-4 winner.
Moya's last eight opponent will be France's Thierry Ascione, who also had to come back from a set down.
Ascione finally saw off Indian Davis Cup player Prakash Amritraj 3-6 6-1 6-2.