Under rainy skies, NASCAR Sprint Cup racer Jamie McMurray led the first Roar Before the Rolex 24 practice session driving the No. 02 Target/TELMEX Chip Ganassi Racing with Felix Sabates BMW Riley. Nick Tandy in the No. 32 Orbit Racing Porsche GT3 Cup topped the GT field.
Both drivers steadily improved their times through the one hour and 45 minutes session as the steady rain came to halt and the track conditions improved. McMurry ended the session with a 2:01.852 (105.177mph), Tandy a 2:05.183 (102.378mph). BGB Motorsports was the quickest of the GX entries, as Ryan Eversley laid down a 2:13.408 (96.066mph) in the No. 38 Porsche Cayman GX.R.
Another session follows beginning at 1:30 p.m. ET.