Six-times MotoGP champion Marc Marquez continued his perfect start with factory Ducati as he completed a weekend double at the season-opening Thailand Grand Prix on Sunday, finishing ahead of his younger brother Alex.

Spain's Marc Marquez completed a double with victory in the opening race of the MotoGP season at the Thailand Grand Prix. The 32-year-old six-time former champion won Saturday's sprint race at the Buriram International Circuit in his first competitive outing for his new team Ducati and started Sunday's race as pole-sitter.

Marc Marquez marked his Ducati debut with an impressive victory on Sunday at the Chang International Circuit in Thailand becoming the first rider since Casey Stoner in 2007 to win on their Ducati debut.

Six-time world champion Marc Marquez won the season-opening Thai MotoGP on Sunday to complete a dominant debut weekend at his new factory Ducati team, having also romped to Saturday's sprint. The start of the new MotoGP season has been overshadowed by the absence of world champion Jorge Martin.