MONTE CARLO (AFP) - Pole Robert Kubica lived up to his billing as a well-fancied dark horse to win this weekends Monaco Grand Prix when he topped the times in Saturday mornings final free practice session. The 25-year-old Renault driver delivered a best lap of one minute 14.806 seconds to top the times, just 0.046 seconds ahead of nearest rival Felipe Massa of Ferrari, the man whose seat is reportedly under threat next season by the Pole. Australian Mark Webber was third fastest for Red Bull, one-tenth of a second off the pace, ahead of 2008 champion Briton Lewis Hamilton in the leading McLaren, German Sebastian Vettel in the second Red Bull and German veteran, seven-times world champion Michael Schumacher, 41, in a Mercedes. Germanys Nico Rosberg was seventh in the second Mercedes, but ahead of Swiss Sebastien Buemi of Toro Rosso, German Adrian Sutil in the leading Force India and defending champion Briton Jenson Button in the second McLaren. Two-times world champion Fernando Alonso of Ferrari was down in 16th at the end of the session following a major accident after 20 minutes when the Spaniard hit the barriers hard at Massenet and lost both right-side wheels of his Ferrari. Alonso was fastest at the time after dominating both free practice sessions on Thursday and the accident left the Ferrari team with a great deal of repair work to do before Saturday afternoons qualifying session. After the peace and calm of Thursdays activity, the third practice produced far more incident with the top spot on the time-sheets changing hands frequently - the fastest men included 20-year-old Spaniard Jaime Alguersuri of Toro Rosso and Schumacher as well as the usual suspects. Webber looked likely to be quickest of all, but when he was attempting to improve his then-fastest lap in the final minutes on super-soft tyres he was slowed by Schumacher who, in turn, had been delayed by Russian Vitaly Petrov of Renault. This incident was enough to give Kubica his chance to go top before Webber improved again, but not by enough, in a vain bid to clock the fastest lap. Schumacher and Petrov were among many drivers to have minor incidents, both taking separate trips down the Mirabeau escape road. Petrov also came close to running into Brazilian Lucas di Grassis Virgin. Sutil required a new rear wing on his Force India after spinning into the Casino Square barriers and Massa came close to damaging the second Ferrari with some lurid near-misses at Loews and at the Swimming Pool exit in a session that suggested qualifying will be anything but a cool and processional affair.