Jenson Button in the race at the Hungarian Grand Prix.

Jenson Button celebrated his 200th Formula One race with victory at the Hungarian Grand Prix, where Red Bull's Sebastian Vettel stretched his commanding lead in the championship with a second-place finish in wet conditions yesterday.

McLaren's Button was steadiest in the constant drizzle at the Hungaroring circuit to secure his 11th career victory, finishing 3.5 seconds in front of Vettel.

Fernando Alonso of Ferrari finished third ahead of McLaren's Lewis Hamilton, who led for most of the race but dropped back due to five pit stops and a drive-though penalty. Mark Webber was fifth to stay closest in the standings to his Red Bull teammate, who now leads by 85 points.

Felipe Massa of Ferrari finished sixth ahead of Di Resta, with Sebastien Buemi of Toro Rosso ending eighth after a 23rd-place start. Nico Rosberg of Mercedes was ninth and Jaime Alguersuari of Toro Rosso took the last point in 10th.

Michael Schumacher of Mercedes dropped out of the race after 28 laps, soon after Nick Heidfeld quickly exited his Renault, which was engulfed in flames after being released from the pit lane in a smoldering state.

Stewards eventually put the blaze out although Vettel nearly ran into fire officials coming out of a pit stop.

The 24-year-old Vettel leads comfortably overall with 234 points - ahead of Webber with 149. Third-place Hamilton trails Vettel by 88 points and Alonso is 89 behind. Button, who also won the Canadian GP on June 12, is 100 points back.

The constant drizzle at the Hungaroring track made for an unnerving race as cars slipped off track and spun out throughout. Tire strategy proved key with Hamilton swapping a number of times then finishing with a penalty after forcing Force India's Paul Di Resta off-track as Hamilton recovered from a spin.

Red Bull's inability to convert poles into race wins continued as Vettel led the McLarens out of the slick start until the fifth lap when Vettel ran wide at the second turn for Hamilton to move inside. Red Bull has started all 11 races on pole, winning six.

Button passed Vettel at the same corner nine laps later.