Updated

Paris, France (SportsNetwork.com) - A pair of top-four seeds -- reigning champion David Ferrer and Juan Martin del Potro -- posted second-round wins Wednesday at the $3.65 million Paris Masters tennis event.

The third-seeded French Open runner-up Ferrer held off Czech Lukas Rosol 6-0, 2-6, 6-3, while the fourth-seeded former U.S. Open champion del Potro dismissed Croat Marin Cilic 6-4, 7-6 (7-3) on the hardcourts at Palais Omnisports de Paris-Bercy. Del Potro is fresh off his title in Basel, while Ferrer was a runner-up in Valencia in his native Spain last week.

Ferrer bested 6-foot-8 Pole Jerzy Janowicz in last year's Paris Masters finale.

Another top-10 winner was No. 7 seed Stan Wawrinka, who got past Spanish left- hander Feliciano Lopez 6-3, 3-6, 6-3 on Day 3.

Meanwhile, 12th-seeded Spaniard Nicolas Almagro beat Croat Ivan Dodig 6-4, 6-3, 13th-seeded American John Isner launched 27 aces in sneaking past Pole Michal Przysiezny 7-6 (7-3), 4-6, 6-3, and 15th-seeded Frenchman Gilles Simon edged out fellow countryman Nicolas Mahut 6-4, 6-7 (5-7), 7-6 (7-3).

A mild upset came when rising Bulgarian Grigor Dimitrov took out 16th-seeded Italian Fabio Fognini 6-3, 5-7, 6-2. Dimitrov captured his first-ever ATP title in Stockholm two weeks ago.

This week's big winner will collect $720,000.