Spain's Jorge Lorenzo, the Yamaha rider who leads the world championship chase, won his fifth consecutive pole position of the season in US MotoGP qualifying. Lorenzo, who began the weekend with a 47-point series lead, set the pace with a lap of 1min 20.978secs for last night's showdown. Ducati rider Casey Stoner was second in 1:21.169 with Honda's Andrea Dovizioso, of Italy, third in 1:21.617. Spaniard Dani Pedrosa, who won at Laguna Seca last year and is second in the drivers' championship, was fourth in 1:21.655 on his Honda. American Ben Spies, a Yamaha rider, qualified fifth with Italy's Valentino Rossi, the reigning world champion, completing the second row in sixth.