The duo 's bitter rivalry stepped up a gear after the 2008 US Grand Prix , where they clashed in spectacular style as Casey Stoner attempted to defend his title .
Rossi went all out to reclaim it .
The duo 's bitter rivalry stepped up a gear after the 2008 US Grand Prix , where they clashed in spectacular style as Casey Stoner attempted to defend his title and Rossi went all out to reclaim it .