Having started the American Le Mans Series with victory at Sebring, Risi Competizione were unable to make it two from two after Pierre Kaffer and Jaime Melo were forced out of round two in St Petersburg.
Melo had taken pole position in the GT2 class, with Kaffer taking the start of the race and leading for the opening ten laps before losing position to the Porsche of Wolf Henzler.
The German held second before being forced to pit on lap 27 with front left suspension failure, with the team unable to fix the car in order to get Melo out on track.
“We don't know yet what happened; we'll have to figure it out but it looks like it's something on the suspension,” Kaffer said. “We'll have to analyse this later. It's a shame for the team and the mechanics because we were in a good spot for the race and the championship, and to stop the race is a shame for us and for Ferrari.
“There was no contact, nothing, with the wall or other people but I felt after two or three laps that something was wrong with the car. It felt like a slow puncture but I was thinking, 'oh maybe I have [tyre] pickup or something like this'. I kept trying to continue until our pit stop, and we had Jamie ready to jump in the car, but it turned out to be a bigger problem than we could deal with during the race.”