5. Troy Corser – 2 Titles, 15 Race Wins

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Troy Corser is tied with Max Biaggi for race wins during their respective championship seasons, but whereas Biaggi won both of his aboard an Aprilia, Corser is the second man in this list to have his two championships aboard motorcycles from two different manufacturers. Corser also owns the record of the longest time span between his two championships – nine years! In 1996 Corser won his first title aboard a Ducati 916, then, in 2007, he won his second title aboard a Suzuki GSX-R1000 – giving Suzuki its one and only World Superbike Riders Championship title.