Mark James "Frosty" Winterbottom is an Australian professional racing driver. He currently competes in the Repco Supercars Championship, driving the No. 18 Chevrolet Camaro ZL1 for Team 18. His career highlights include winning the 2013 Supercheap Auto Bathurst 1000, twice winning the Sandown 500 and receiving the Mike Kable Young Gun Award in 2003. Winterbottom has also won his maiden championship title in the 2015 International V8 Supercars Championship, making it the first title for Ford in five years. He also voices himself in the Australian version of the hit 2011 film, Cars 2.

Team 18 is an Australian motor racing team currently competing in the Supercars Championship, running two Chevrolet Camaro ZL1s. The team's current drivers are Mark Winterbottom and David Reynolds.