"Just a few dry practice sessions on Saturday gave WSBK teams limited possibility to setup their machines, since the Sunday qualifying was a bath of constant down-pouring rain. Hard-compound SCR2 Diablo Rain tires were supplied in order to guarantee excellent performance on this wet abrasive track and to keep riders' confidence in such difficult conditions, considering the need for numerous changes in traction control settings. As always, Pirelli was prepared with full-rain, intermediate and Diablo Superbike slicks, a compliment of 1500 tires for this USA round. Superpole's variable conditions left two Ducatis and two Yamahas in the front row for race day. Cold temperatures overnight made for a cold but drying track for morning warm-up, but the cloud break showed promise. Even with 3 front and 3 rear solutions (SC1, SC2) available for dry racing, including last year's race-wining tires, 20?C on the asphalt and uncertain bike settings moved all riders to the SC1 mid-soft Diablo Superbike rear tires for Race 1, the high-performance choice for colder conditions. Still, some riders pushed too hard at the race start and caused increased tire wear, accelerated also by various wet spots on the track. It was pole sitter and Best Lap winner Carlos Checa (Ducati) who used his Diablo Superbike SC1 tires to lap consistently in the 1'49 and 1'50s, finally earning a 2.7 second win over Ducati riders Smrz and Guintoli, the latter his first podium of the season. Race 2 brought only one tire change by Lascorz (Kawasaki) who switched to the A front, although many discussed changes with the sun out and a warming track. Aprilia riders Camier and Biaggi came back to fight in Race 2 for a 2nd and 3rd place finish, but the double-win rider Checa (Ducati) set the Best Lap of 1'48.827 and repeated his excellent results of three years ago at Miller Motorsports Park. Biaggi was proceeded by Laverty (Yamaha) and Fabrizio (Suzuki) to make 4 manufacturers in the top five."