LA PUNT (Switzerland) (AFP) Dutchman Robert Gesink claimed a prestigious win on the sixth stage of the Tour of Switzerland Thursday to take command of the race. The Rabobank climbing specialist attacked late on the third and final climb, crested the summit alone and raced the remaining 10km downhill to finish well ahead of an eight-man group of chasers. Rigoberto Uran led the pursuit group, which included Lance Armstrong, over the finish line 42sec in arrears. Gesink now holds a 29sec lead on Uran, of Caisse dEpargne, with Swiss rider Steve Morabito at 36sec and Franck Schleck at 38sec. I followed Andy Schleck, who was going very fast, said Gesink. Im going to fight for the overall title but also for the jersey for the best young rider. Its my last chance this year. Uran isnt my leading rival, notably for the final time-trial. The real specialists will make the difference, Armstrong maybe... Armstrong, who is sitting seventh overall, 55sec behind the winner, said he was satisfied with his performance in the mountains. It was a tough day. To be honest, I suffered at the beginning of the Albula climb. It was hard to find my rhythm, said the seven-time Tour de France winner. But overall Im quite happy. It was a long day that was also a good test. Team RadioShack are ready for the Tour de France. The sixth stage was a 213 km ride from Meiringen and La Punt and with two unclassified climbs the Sustenpass and Albulapass and one category one climb, the Oberalppass, a change of race leader was a distinct possibility. Germanys Tony Martin began the day with a 01sec lead on defending champion Fabian Cancellara of Saxo Bank, but the Swiss was never in contention on the long, sapping climbs of the Swiss Alps. Martins HTC-Columbia team tried to provide as much support as possible on the long climb over the Albulapass, however a series of attacks and counter-attacks upset the Germans plans and he eventually trailed in over two minutes behind. A convincing attack by Tour de France runner-up Andy Schleck appeared to set him up to take command of the race but the Luxemburger inexplicably ran out of steam. Gesink had closed the gap to Schleck and, sniffing an opportunity, he raced away from Schleck to go on and forge a win that could well prove key to him winning the race overall. Fridays seventh stage is another hilly affair but the 204.1km ride from Savognin to Wetzikon will be far easier than the sixth stage. The race ends on Sunday.