Copyright 2003, Roadracing World Publishing, Inc.

Mat Mladin won the second Superbike race at Infineon Raceway in much the way he won the first, quickly pulling away and building a lead of almost 10 seconds before cruising to the finish.

Aaron Yates finished second, 7.5 seconds behind, with Ben Bostrom third, another 9 seconds behind, after challenging Yates for second at one point.

Miguel Duhamel, third in the first Superbike race, did not start, having crashed in the Supersport race and either breaking or not breaking his collarbone, depending upon who you believe.

As Mladin crossed the finish line, the AMA Pro Racing timing & scoring system, which had been acting strangly from the start of practice, started varying the splits between riders.

Results
1. Mat Mladin, Suzuki, 28 laps
2. Aaron Yates, Suzuki, -7.8 seconds
3. Ben Bostrom, Honda, -16.379
4. Kurtis Roberts, Honda, -25.6
5. Eric Bostrom, Kawasaki, -33.6
6. Larry Pegram, Ducati, -57.1
7. Jason Pridmore, Suzuki, -74
8. Jordan Szoke, Suzuki, -79
9. Steve Crevier, Suzuki, -81
10. Shawn Higbee, Suzuki, -83
11. Vincent Haskovec, Suzuki, -86
12. Michael Barnes, Suzuki, -1 lap
13. Lee Acree, Suzuki, -1 lap
14. Geoff May, Suzuki, -1 lap
15. Jake Holden, Suzuki, -1 lap
16. James Randolph, Suzuki, -1 lap
17. Francis Martin, Suzuki, -1 lap
18. Mike Ciccotto, Suzuki, -1 lap
19. Jeremy Toye, Suzuki, -1 lap
20. Dean Mizdal, Suzuki, -1 lap
21. Scott Jensen, Suzuki, -1 lap
22. Clint McBain, Suzuki, -1 lap
23. Brian Livengood, Suzuki, -1 lap
24. Jack Pfeifer, Suzuki, -1 lap
25. Rob Mesa, Suzuki, -1 lap
26. Alan Schmidt, Suzuki, -1 lap
27. Rob Christman, Suzuki, -1 lap
28. John Wilson, Suzuki, -1 lap
29. Chris Voelker, Ducati, -1 lap
30. Marco Martinez, Suzuki, -1 lap
31. Garry Combs, Suzuki, -1 lap
32. Tom Wertman, Suzuki, -2 laps
33. Kim Nakashima, Suzuki, -5 laps
34. Anthony Gobert, Ducati, -19 laps, DNF, mechanical
35. Jeff Williams, Suzuki, -19 laps
36. Andy Deatherage, Suzuki, -23 laps, DNF