Switzerland's former world number one Martina Hingis said her renewed hunger for competition inspired her forthcoming comeback in doubles but she has no plans to return in singles.
Francesca Schiavone set up a repeat of last year's French Open final against Samantha Stosur in the Italian Open quarter-finals as top seed Caroline Wozniacki also advanced to the last eight on Thursday.
The Russian faces unseeded Slovak Daniela Hantuchova in the semi-finals of the Zurich Open.
Top seed Jelena Jankovic of Serbia and third-ranked Slovak Daniela Hantuchova enjoyed contrasting opening-round victories in the Auckland Classic on Tuesday.
Patty Schnyder defeated third seed Marion Bartoli of France while Daniela Hantuchova edged past Czech Nicole Vaidisova.
Top seed Justine Henin rallied from a set down to beat Jelena Jankovic and reach the final of the Qatar Open.
Justine Henin knocked out Swiss Patty Schnyder 3-6, 6-4, 7-5 to reach the Qatar Open semi-finals.
The rising Serbian star beat Martina Hingis 7-6, 6-2 to reach the semi-final of the WTA Dubai Open.
The US Open champion claimed her fourth title of the year on Sunday by beating unseeded Hantuchova 6-1, 4-6, 6-3.
Patty Schnyder's hopes of qualifying for the WTA Championship in Madrid were dealt a blow when she was beaten 6-2, 7-5 by Slovak Daniela Hantuchova in the first round of the Zurich Open.
Micromax's Canvas Selfie wants to make women 'more presentable'.