The #75 Krohn Racing Pontiac Riley topped the charts in each Daytona Prototype practice session for Sunday's Grand-Am Rolex Series race at Barber Motorsports Park, with teen sensation Colin Braun coming out on top for the day.

The 18-year old posted a fast time of 1min 22.037secs in Friday's afternoon session, while team-mate Nic J?nsson doubled up the success of the Krohn machine by posting the fastest time in the morning session. Braun - driving with then team-mate Jorg Bergmeister - captured the win in last year's Porsche 250 presented by Bradley Arant at the Birmingham track.

"We were out there running through our programme of changes we wanted to run through," the youngster said, "The car was really good. We're really working hard to make sure we've got a good race car. I don't think we have that much for [the #99 GAINSCO car]. Everybody put new tyres on at the end of practice, so lowering our time was not a huge surprise. Krohn Racing had a good test here, and the guys are working really hard this weekend, working really well together. I think we just have a good car."

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Alex Gurney, driving the #99 Pontiac Riley, led for most of the afternoon session until his time was eclipsed by Braun - by less than five-hundredths of a second - on the session's last lap.

"We've been learning the whole time," Gurney said, "Yesterday, we were really scratching our heads. The #75 car has been very quick all weekend. We definitely have been improving the GAINSCO car every session, and we improved it quite a bit more in that last session. Jon Fogarty, Kyle Brannan and I really worked to perfect the balance, because this track is very complex and technical. The challenge is to find the best compromise that creates a stable, drivable car."

The #10 SunTrust Racing Pontiac Riley of Max Angelelli ran third fastest, the Italian building to what he hopes will be a strong finish to improve on his second place in points behind Scott Pruett. Angelelli will share this weekend's duties in the #10 machine with Memo Gidley.

Two Lexus Rileys followed the Pontiac trio in the top five, led by the #19 Chip Ganassi with Felix Sabates Z-Line Designs/Mission Residential car driven by Michael Valiante, who comes off of a strong second-place effort at Iowa Speedway last weekend. The #60 Michael Shank Racing entry driven by Oswaldo Negri and Mark Patterson was fifth fastest.

The Daytona Prototype class will qualify on Saturday morning for the stand-alone Porsche 250 on Sunday afternoon.