YEONGAM, South Korea (AP) _ McLaren driver Jenson Button set the fastest time in Saturday's pre-qualifying practice session for the Korean Grand Prix, indicating Red Bull's remarkable sequence of pole positions this season could come to an end.

Button's lap of 1 minute, 36.910 seconds was 0.289 seconds faster than teammate Lewis Hamilton, meaning McLaren had topped the timesheets in all three practice sessions, at what is the team's 700th Grand Prix.

Red Bull has taken pole in all 15 races this season _ 12 for Sebastian Vettel and three for teammate Mark Webber.

Webber was third fastest in the Saturday morning sesssion, eight tenths of a second off Button's time, while Vettel _who clinched his second straight F1 drivers championship at last weekend's Japanese GP _had a frustrating session and was almost three seconds slower than Button in ninth place.

After Friday's rain-drenched practice, drivers had their first chance to use the dry-weather tires ahead of qualifying.

Ferrari driver Fernando Alonso, who won the inaugural Korean GP last year, was fourth followed by teammate Felipe Massa.

Mercedes' Michael Schumacher was sixth ahead of Renault's Vitaly Petrov and Force India's Adrian Sutil. Mercedes' Nico Rosberg was 10th fastest, behind Vettel.