Matt Roberts introduces live coverage from Shanghai of the fourth race of the MotoGP season. Reigning champion Casey Stoner won in China last year, but the Australian is finding the going a lot tougher in 2008, and can expect plenty of pressure from Valentino Rossi. British fans will be monitoring the progress of James Toseland, who has made an impressive start to his first season in MotoGP after stepping up from World Superbikes. With commentary from Charlie Cox and Steve Parrish.
