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The AMA Pro Road Racing series makes its third annual stop in Utah this weekend at Miller Motorsports Park in Tooele.

All four classes of motorcycles will race, including the top National Guard SuperBike series on both Saturday and Sunday.

Three-time defending National Guard SuperBike champion Josh Hayes, atop the standings with 223 points after winning six of the last seven events, will look to extend his lead over Josh Herrin, last season's rookie of the year who sits just 11 points back. Both riders race for the Monster Energy Graves Yamaha team. Colombian Martin Cardenas, in third place with 207 points, is the only other racer who poses a threat to Hayes' bid for a fourth straight championship.

This weekend's events at Miller Motorsports Park constitute the sixth round of racing for the season, with just two more rounds to be raced after this weekend before the World Championships in Monterey, Calif., in September.

The top three series — the National Guard SuperBike, GoPro Daytona SportBike and Motorcycle-Superstore.com SuperSport — will each race on both Saturday and Sunday. The Vance & Hines Harley-Davidson series will race on Sunday only.

The Miller Motorsports Park track features a road course that is just over 3 miles long, with a straightaway where the National Guard SuperBikes can reach speeds of up to 190 mph. The National Guard SuperBike and GoPro Daytona SportBike races will feature 16 laps, while the Motorcycle-Superstore.com SuperSport races is 13 laps. The Vance & Hines Harley-Davidson race will have eight laps.

Practice races and qualifying are set for Friday. Admission is free on Friday. Practices start at 11 a.m., and qualifying begins at 2 p.m.

On Saturday at noon and Sunday at 11:15 a.m., fans are invited to spend 45 minutes on pit lane, where they can meet riders, collect autographs, take pictures and see the motorcycles up close.

There will also be a stunt rider in the paddocks, as well as go-cart racing and a zip line available to fans.