Marlboro Ducati’s Casey Stoner has led every practice and qualifying session during the Red Bull U.S. Grand Prix at Mazda Raceway Laguna Seca, and he continued that trend during Sunday morning’s short warm-up session. After the new, dedicated practice start period, Stoner set about lapping on his Bridgestone-shod GP07 and turned a 1:21.975 on his 16th of 16 laps. That time was quicker than the 1:22.292 he recorded to earn pole position during qualifying Saturday afternoon. Rizla Suzuki teammates Chris Vermeulen (1:24.400) and John Hopkins (1:24.446) both improved on their qualifying times and were the second- and third-fastest riders in the warm-up, respectively. The session included two crashes. First, fill-in rider Miguel Duhamel tucked the front going into turn three and crashed his Gresini Honda RC212V. He walked away from the scene but did not go back out in the practice. Seconds later, defending World Champion Nicky Hayden got into turn 11 too hot and lost the front end of his Repsol Honda RC212V. Hayden crossed the track, ran the short distance to his garage, got on his back-up bike and continued in the session. Gresini Honda’s Marco Melandri was seen in his leathers in his garage, but the young Italian did not record a time during the warm-up. Melandri crashed heavily during MotoGP qualifying Saturday and suffered an injury to his left ankle. 2007 FIM MotoGP World Championship Red Bull U.S. Grand Prix Mazda Raceway Laguna Seca Monterey, California July 22, 2007 Warm-up Results: 1. Casey Stoner (Duc GP07), Bridgestone, 1:21.975* 2. Chris Vermeulen (Suz GSV-R), Bridgestone, 1:22.400* 3. John Hopkins (Suz GSV-R), Bridgestone, 1:22.446* 4. Valentino Rossi (Yam YZR-M1), Michelin, 1:22.757 5. Dani Pedrosa (Hon RC212V), Michelin, 1:22.857 6. Loris Capirossi (Duc GP07), Bridgestone, 1:22.977 7. Colin Edwards (Yam YZR-M1), Michelin, 1:23.126 8. Roger Hayden (Kaw ZX-RR), Bridgestone, 1:23.345* 9. Alex Barros (Duc GP07), Bridgestone, 1:23.424* 10. Randy De Puniet (Kaw ZX-RR), Bridgestone, 1:23.546 11. Nicky Hayden (Hon RC212V), Michelin, 1:23.738, crash 12. Anthony West (Kaw ZX-RR), Bridgestone, 1:23.898 13. Chaz Davies (Duc GP07), Bridgestone, 1:23.952* 14. Sylvain Guintoli (Yam YZR-M1), Dunlop, 1:23.993 15. Carlos Checa (Hon RC212V), Michelin, 1:24.132 16. Kurtis Roberts (KR212V), Michelin, 1:24.291 17. Makoto Tamada (Yam YZR-M1), Dunlop, 1:24.469 18. Shinya Nakano (Hon RC212V), Michelin, 1:24.562 19. Miguel Duhamel (Hon RC212V), Bridgestone, 1:25.822, crash 20. Marco Melandri (Hon RC212V), Bridgestone, did not ride * faster than qualifying time