SPA-FRANCORCHAMPS (AFP) - Mark Webber set himself up for a memorable 35th birthday on Saturday when he topped the times for Red Bull in Friday afternoon's second free practice session for this weekend's Belgian Grand Prix. The Australian, who is the only man among the leading drivers still without a win this year, clocked a fastest time of one minute and 50.321 seconds to outstrip his nearest rival Fernando Alonso of Ferrari by one-tenth of a second. Two-times champion Spaniard Alonso was one of several men to trade fastest laps with Webber along with his Red Bull team-mate and defending champion German Sebastian Vettel and McLaren's Briton Jenson Button. Seven-times champion German Michael Schumacher, 42, had topped the times in the morning's opening session for Mercedes, marking the 20th anniversary of his Formula One debut with a flourish. But in the afternoon he wad down in 11th, five places behind his Mercedes team-mate compatriot Nico Rosberg, while Vettel wound up 10th. Button was third ahead of his McLaren team-mate and fellow-Briton Lewis Hamilton, the 2009 and 2008 champions maintaining impressive progress on a day of near-incessant heavy rain at the majestic Spa-Francorchamps circuit in the sprawling pine forests of the Belgian Ardennes. Alonso's Ferrari team-mate Brazilian Felipe Massa, a fortunate winner of last year's race, was fifth ahead of Rosberg, Mexican Sergio Perez of Sauber and German Nico Hulkenberg, who revelled in a rare opportunity to have a day's running for the Force India team. Briton Paul Di Resta was ninth in the second Force India car ahead of Vettel and Schumacher. Few fans at the track can have enjoyed their day other than the true die-hards as Spa's infamous and capricious micro-climate delivered a deluge that forced many to hide under canvas in the campsites. Earlier, Michael Schumacher topped the times for Mercedes during Friday morning's rain-soaked opening practice for Sunday's Belgian Grand Prix. The German, who celebrates his 20th anniversary since his debut in 1991 this weekend, clocked a lap of the Spa Francorchamps circuit in one minute 54.333 seconds on a dry track at the beginning of the session, just 0.5 seconds quicker then his Mercedes team-mate and fellow German Nico Rosberg. As if to acknowledge the 42-year-old and seven-times champion's achievements, the heavens opened minutes afterward and prevented any following driver from beating his time. Drivers were therefore forced to drive with extra care and caution and although the track began to dry towards the end of the session, never came close to matching Schumacher's time. McLaren's Jenson Button was third fastest with a time of two minutes 02.740 followed by championship leader German Sebastian Vettel of Red Bull. Button's team-mate and fellow Briton Lewis Hamilton was fifth quickest ahead of German Adrian Sutil of Force India. Brazilians Felipe Messa of Ferrari and Williams driver Rubens Barrichello were seventh and eighth quickest respectively ahead of Spaniard Jaime Alguersuari of Toro Rosso and Japanese Kamui Kobayashi of Sauber who completed the top ten. The session also saw a frustrated Bruno Senna spin off at turn nine on his debut for Renault as did Briton Paul di Resta of Force India. Second practice times: 1. Mark Webber (AUS) Red Bull 1min 50.321sec, 2. Fernando Alonso (ESP) Ferrari 1:50.461, 3. Jenson Button (GBR) McLaren 1:50.770, 4. Lewis Hamilton (GBR) McLaren 1:50.838, 5. Felipe Massa (BRA) Ferrari 1:51.218, 6. Nico Rosberg (GER) Mercedes GP 1:51.242, 7. Sergio Perez (MEX) Sauber 1:51.655, 8. Nico Hulkenberg (GER) Force India 1:51.725, 9. Paul di Resta (SCO) Force India 1:51.751, 10. Sebastian Vettel (GER) Red Bull 1:51.790, 11. Michael Schumacher (GER) Mercedes GP 1:51.922, 12. Pastor Maldonado (VEN) Williams F1 1:52.750, 13. Kamui Kobayashi (JPN) Sauber 1:52.780, 14. Jaime Alguersuari (ESP) Toro Rosso 1:52.911, 15. Sebastien Buemi (SUI) Toro Rosso 1:53.009, 16. Rubens Barrichello (BRA) Williams F1 1:53.156, 17. Bruno Senna (BRA) Lotus-Renault 1:53.835, 18. Jarno Trulli (ITA) Lotus 1:55.051, 19. Timo Glock (GER) Virgin Racing 1:55.494, 20. Heikki Kovalainen (FIN) Lotus 1:56.202, 21. Jerome d'Ambrosio (BEL) Virgin Racing 1:56.816, 22. Vitantonio Liuzzi (ITA) Hispania 1:57.450, 23. Daniel Ricciardo (AUS) Hispania 1:57.612, 24. Vitaly Petrov (RUS) Lotus-Renault 2:02.234