SPA, Belgium – Nico Rosberg extended his championship lead and deepened his rift with Lewis Hamilton. The gloves are truly off between the Mercedes rivals in their bitter fight for the Formula One title.

After Rosberg finished second in Sunday’s Belgian Grand Prix, Hamilton claimed the German driver acknowledged he had deliberately crashed into him early in the incident-packed race, which ended with Australian Daniel Ricciardo securing his third victory of the season.

“We just had a meeting about it and he basically said he did it on purpose,” said Briton Hamilton, struggling to contain his anger. “He said he did it on purpose. He said he could have avoided it. He said ‘I did it to prove a point.’ ”

There was no immediate response from Rosberg, who has 220 points with Hamilton still on 191. Third-place Ricciardo has 156 points.

Save 75% on a Digital Subscription Today

The huge tensions inside the Mercedes team overshadowed Ricciardo’s impressive performance for the Red Bull team.

Dixon triumphs

SONOMA, Calif. – Scott Dixon surged ahead with three laps left for a victory at Sonoma Raceway, while IndyCar Series points leader Will Power recovered from a midrace spin to finish 10th heading to the season finale.

Power leads Team Penske teammate Helio Castroneves by 51 points heading to the double-points finale in Fontana, Calif., on Saturday. Castroneves finished 18th on Sunday.

Dixon is out of the race to defend his 2013 title, but earned his 35th career victory.