Bobby Sak tops Puerto Rico warm-up.

SAN JUAN, Puerto Rico -- Bobby Sak's No. 10 Revolution Motorsports Chevrolet Corvette continued to lead the Motorock Trans-Am Tour for the BFGoodrich Tires Cup speed charts at the Puerto Rico Grand Prix during Sunday morning warm up. Sak set the pace during the 15-minute session, turning a fastest lap at 1:07.361 at 85.509 miles per hour.

Sak built on his efforts in third-round practice yesterday, which he led, driving the No. 2 Revolution Motorsports/Trenton Forging machine, usually wheeled by his father, Don.

Scott Pruett was second fastest in the No. 7 Motorock/Jaguar R Performance Jaguar XKR, ahead of Jorge Diaz, Jr. (No. 8 Don Q Rum Jaguar XKR), Tomy DrissI (No. 5 Stuck on You, The Movie Jaguar XKR), and Wally Castro (No. 3 Puerto Rico Lottery Jaguar XKR).

The Puerto Rico Grand Prix, the 11th and final round of the 2003 Trans-Am Tour championship, is scheduled to start at 2 p.m. AST today. The race will air LIVE on SPEED Channel at 1 p.m. EST.