Top-seed Agnieszka Radwanska and defending champion Maria Sharapova set up a mouthwatering quarterfinal clash at the Porsche Tennis Grand Prix after both players eased through in straight sets.

Radwanska, still searching for a first title of the year, booked her quarter-final berth with a crushing 6-3 6-2 win over Italian Roberta Vinci, while Sharapova, who is aiming for a third consecutive title in Stuttgart, defeated compatriot Anastasia Pavlyuchenkova, 6-4, 6-3.

Sharapova has stuttered since her return from injury and has yet to reach a final in five tournaments this season, however after struggling to a three-set win in her opening round against Lucie Safarova the Russian has shown signs that she is approaching the sort of form that has seen her lift the title in the Porsche Arena for the last two years.

Radwanska's game this season has been very consistent but she will still be wary of her opponents' dominant 8-2 lifetime record against her.

Two upsets came during yesterday's play as 2009 Stuttgart champion Svetlana Kuznetsova upended world number five Simona Halep 7-5 7-6, while Spaniard Carla Suarrez Navarro will take on Sara Errani after she cut down number four seed Angelique Kerber, 7-5 6-4.

Kuznetsova will take on Ana Ivanovic in the quarter-finals after the former world number one rallied to beat the 2011 champion Julia Goerges 1-6 6-2 6-2.

Ivanovic has an 8-4 lifetime record against her opponent in the next round though and will be confident of safe passage to the final four.

2009 Stuttgart winner Jelena Jankovic will take on compatriot Alisa Kleybanova after the former world number one battled past Indian Wells winner Flavia Pennetta.

The winner of the tournament overall takes home a whopping $135,000 and the added bonus of a 911 Porsche Carrera.

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