Top seed Justine Henin held off a tough challenge from Alicia Molik to reach the quarter-finals of the Qatar Open.
Henin arrived in Qatar on the back of her victory in Dubai
The Belgian dominated the first set but failed to serve out the match in the second, taking her into a nervy tie-break and a 6-2 7-6 (11-9) win.
Henin will now face fifth seed Patty Schnyder in the last eight after the American beat Spain's Anabel Medina Garrigues in straight sets 6-3 6-4.
Third seed Martina Hingis beat Maria Kirilenko 6-2 6-2 to also go through.
Henin was relieved to come through a tough test against Molik, admitting: "You always expect a tough match against a player like Alicia. I had a good start and then lost my energy a little bit.
(Schnyder) is a special player. It will be a tough one. I have to raise my level if I have to win
"I lost some intensity in my game. And she gave me lots of trouble on her serve. I wasn't playing that well that time in the second set.
"But I came back and found everything. I didn't do my best, but I won in two sets. That is the key for me."
And the 24-year-old expects a tough match against Schnyder, saying: "She has really given me a lot of trouble in the past. We are always involved in big fights, in three sets.
"She is a special player, unlike others as she is a lefty (left-hander). It will be a tough one and I have to raise my level to win."
India's Sania Mirza withdrew with a knee injury before her second-round match against Ukrainian Kateryna Bondarenko.
The 20-year-old suffered the injury in her first-round victory over Italian Romina Oprandi.