The second running of the Calder Challenge, a 4-furlong (880-yard) race for American Quarter Horses and Thoroughbreds, is set for July 13 at Calder Race Course in Miami, Florida. This year's renewal will offer a $50,000-guaranteed purse, up from $25,000 last year.

The race will pit four Thoroughbreds selected by the Calder racing secretary against four Quarter Horses selected by AQHA, with first preference given to MBNA Challenge-enrolled horses, and second preference based on money earned at 550 yards and longer in 2001-02. Entries for the race close July 10.

The race will be part of Calder's Summit of Speed, a day of stakes races for Thoroughbred sprinters with purses totaling $1.4 million.

Last year's running pitted Texas horsemen against Florida horsemen, with the Florida-based Thoroughbred Diamond Studs winning the race over the Quarter Horse King Rick Rack in :46.21. The Texas-Florida rivalry is expected to be renewed again this year.

For more information on entering a Quarter Horse in this race, contact Jim Persinger at AQHA at (806) 376-1286.

For information on entering a Thoroughbred in this race, contact the Calder Race Course racing secretary's office at (305) 625-1311.