Estoril, Portugal, 27 April 2011 | AAP

Jarmila Gajdosova set-up an all-Australian second round clash in the Estoril Open with a comfortable victory on Tuesday.

Gajdosova, seeded second in the tournament, celebrated her 24th birthday with a 6-4 6-0 win over Czech veteran Renata Voracova.

Next up will be a clash against West Australian Casey Dellacqua for a quarter-final berth.

Gajdosova, who has returned to competing under her maiden name following the break-up of her marriage to Australian men’s player Sam Groth, had to overcome a slow start to defeat Voracova.

Trailing 1-3 in the first set, Gajdosova hit eight aces to storm back into the contest and seal her 19th tour-level win this season.

Elsewhere, fourth seed Anastasija Sevastova of Latvia lost to Pole Ursula Radwanska 5-7 7-6 (7-5) 6-1.

Third seed Klara Zakopalova was also a winner, defeating Beatriz Garcia Vidagany by 6-4 7-6 (7-3).

Eighth-seeded Hungarian Greta Arn beat Portugal’s Maria-Joao Koehler 6-2 3-6 6-3.

In the men’s draw, former US Open winner Juan Del Potro struggled to defeat Portugal’s world No.488 Pedro Sousa as the big Argentine made an unconvincing start to his claycourt season.

Del Potro, who played only three events in 2010 due to right wrist surgery, emerged a 6-2 3-6 6-3 winner after nearly two hours, with qualifier Sousa putting in a respectable showing for the home crowd.

“I like playing here and I had a tough match today. He was playing well at home but I’m happy to go through,” said the winner.

Del Potro is playing this week on clay for the first time this season after resting following his hardcourt outing in Miami.

His last claycourt outing was the 2009 French Open.

“It’s been a long time since 2009, but I’m ready to fight again to win matches,” he said.

The Argentine is trying to play his way into form with the French Open now less than a month away from May 22.

Del Potro moved into a second-round clash with Colombian Alejandro Falla, who advanced as Spain’s Pablo Andujar retired injured at 4-6 6-1 4-4.

French third seed Jo-Wilfried Tsonga, who made a publicity visit in the morning to an old-style classic Portuguese sailing ship, will open his Estoril debut with a match against Pablo Cuevas.

The Uruguayan booked his place with a 6-2 6-4 win over Spaniard Per Riba.

Frenchman Gilles Simon, seeded fourth, will start in the second round after a bye against another South American in Carlos Berlocq, who beat Daniel Gimeno-Traver of Spain 6-4 6-3.

Spanish second seed Fernando Verdasco will aim for a win in his first appearance in eight years at the venue when he plays local Frederico Gil, who put out Italian Flavio Cipolla 6-3 6-2.