Each rider knows championships can be won and lost in a single moment, but Leon Haslam must be hoping his error during the second World Superbike race of the day at Miller Motorsports Park won't come back to haunt him later in the year.

The first time Haslam has retired all season, what started as a 15 point advantage heading into the weekend has swung completely the other way as Max Biaggi completed his third double victory of the season in the USA.

Of course, Biaggi certainly benefitted from the desperately unlucky Carlos Checa, but two second place finishes would have still been enough for him to leapfrog Haslam for the first time this season, even if it would have been by four points rather than 15.

As one of the more popular characters in the pit lane, several riders expressed their sorrow for Checa after he saw an almost certain 50 points snatched away from him by not one, but two, technical problems. Coming on the weekend he scored pole position and broke the lap record, the fact he has actually lost ground to third place Jonathan Rea is a galling return on a weekend he should have made good gains on the leaders.

Still, Rea hasn't moved too far ahead as he battled injury and woe throughout the weekend, the Northern Irishman ailing to just ten points more than Checa.

One of the day's big winners was Noriyuki Haga, who stopped the rot with a third and fourth place finish, putting him just six points adrift of relieving Checa of his top Ducati status.

James Toseland drops to sixth after an underwhelming day, the Briton under pressure now from double top five man Troy Corser.

Meanwhile, Leon Camier, leaps up to eighth position to be just 20 points now from the overall top five. It's worth noting here that this is despite the Aprilia man retiring on four occasions from front running positions this year. Without those, the rookie would almost certainly be challenging for third.

Cal Crutchlow is similarly on Camier's tail after moving past Michel Fabrizio, the Italian nowhere near the form that saw him stand on the podium twice in 2009.

Elsewhere, Aprilia have regained the lead in the manufacturer standings, while an interesting scrap for fourth is shaping up between Honda, Yamaha - and notably - BMW, the trio split by 32 points.

2010 World Superbike Championship rider standings (Previous round standings position in brackets)

1. (2) Max Biaggi Aprilia Alitalia 257 points 2. (1) Leon Haslam Suzuki Alstare 242 3. (3) Jonathan Rea Ten Kate Honda 151 4. (4) Carlos Checa Althea Ducati 141 5. (6) Noriyuki Haga Ducati Xerox 135 6. (5) James Toseland Yamaha Sterilgarda 132 7. (7) Troy Corser BMW Motorrad 127 8. (10) Leon Camier Aprilia Alitalia 115 9. (9) Cal Crutchlow Yamaha Sterilgarda 107 10. (8) Michel Fabrizio Ducati Xerox 102 11. (11) Sylvain Guintoli Suzuki Alstare 95 12. (12) Shane Byrne Althea Ducati 81 13. (13) Jakub Smrz PATA B&G Ducati 61 14. (14) Ruben Xaus BMW Motorrad 53 15. (15) Tom Sykes Kawasaki SRT 42 16. (17) Luca Scassa Supersonic Ducati 40 17. (16) Lorenzo Lanzi DFX Ducati 26 18. (18) Max Neukirchner Ten Kate Honda 31 19. (19) Chris Vermeulen Kawasaki SRT 9 20. (20) Sheridan Morais EmTek Aprilia 3 21. (21) Andrew Pitt Reitwagen BMW 3 22. (22) Joshua Brookes Echo CRS Honda 2 23. (23) Roger Lee Hayden Pedercini Kawasaki 2 24. (25) Broc Parkes Echo CRS Honda 2 25. (24) Matteo Baiocco Pedercini Kawasaki 1

2010 World Superbike Championship manufacturer standings (Previous round standings position in brackets)

1. (2) Aprilia 263 points 2. (1) Suzuki 252 3. (3) Ducati 214 4. (4) Honda 162 5. (5) Yamaha 158 6. (6) BMW 130 7. (7) Kawasaki 45