Bruno Spengler put the ROAL Motorsport BMW Z4 GT3 on top in a rain-soaked warmup for the Total 24 Hours of Spa.
His time of 2:39.192 put him 0.277s clear of the No. 6 Phoenix Audi R8 LMS of Marcel Fässler and 0.838s of the No. 47 AF Corse Ferrari 458 Italia GT3 of Alessandro Pier Guidi.
A heavy rain shower right before the start of the 20-minute session resulted in standing water on a couple places, though the sun made a brief appearance later on.
Besides a couple of hairy moments, no major incidents took place during the session.
Despite the conditions, almost the entire field went out to get their first laps in the rain under their belt, with wet conditions also being forecasted during the race.
The Total 24 Hours of Spa gets underway at 4:30 p.m. local.