Torrential rain at Phillip Island has wreaked havoc on the first day of practice at the Australian MotoGP.

With his Bathurst 1000 win beyond dispute, Will Davison is leading the Enduro Cup.

His appeal may have failed but this year's Bathurst 1000 fallout is not going away after Jamie Whincup took aim at Supercars boss James Warburton for "playing dirty".

Newly-crowned world MotoGP champion Marc Marquez plans to enjoy the Australian race on Sunday but he won't be taking it easy.

The Battle of Bathurst is over. Following a comedy of errors, V8 super team Triple Eight Holden has given up its legal fight to reclaim victory in the Bathurst 1000 from Supercars underdogs Will Davison and Jonathon Webb.

11th place may be little reward for what Supercars great Mark Skaife described as a "once-in-a-generation" drive at this year's Bathurst 1000.

Former motorycling champion Wayne Gardner and his son Remy remain in custody in Japan following an alleged road rage incident before the Montegi MotoGP race at the weekend.

Supercars young gun Chaz Mostert hopes a Bathurst 1000 appeal controversy leads to more simplified racing rules, saying a lack of clarification had made drivers hold back.

Spaniard's fifth win of the season secures a third world MotoGP title, after close rivals Valentino Rossi and Jorge Lorenzo both crashed out.

Injury-prone Australian MotoGP star Jack Miller is confident his broken body will hold up for a crowd-pleasing performance at Phillip Island next weekend.

Bathurst 1000 champion Will Davison is unhappy that his upset victory has been tarnished by the week-long controversy caused by the efforts of his best friend Jamie Whincup's team to overturn the result.

Supercars chief James Warburton has attacked the sport's leading team for trying to win back the Bathurst 1000 by challenging "the umpire's decision" after the race.

"I will miss the sheer speed, downforce and competition, but I want to leave on a high and I'm very much looking forward to my new tasks," he said.

Six-time V8 champion Jamie Whincup's Supercars team has been given until late Friday afternoon to lodge its appeal against the penalty that cost him victory in the Bathurst 1000.

Supercars legend Mark Skaife will make a comeback at Bathurst next year, but not in the touring car classic that helped make him famous.

The outcome of the Triple Eight Holden team's bid to overturn the penalty that cost six-time Supercars champion Jamie Whincup victory in the Bathurst 1000 is unlikely to be decided until after next week's Gold Coast 600.

The Formula One world drivers' championship is Nico Rosberg's to lose.

Peter Brock's brother says Jamie Whincup would not have been a worthy recipient of the winner's trophy named after his famous sibling after a controversial Bathurst 1000 at Mount Panorama.

Nico Rosberg eased to victory at the Japanese Grand Prix on Sunday with a drive that handed Mercedes their third straight constructors championship.