Michael Krumm and Lucas Luhr in the JRM Nissan No.23 moved a step closer to the drivers' championship title by claiming pole position for this afternoon's Qualifying Race in San Luis.
Second was the No.11 Team China Corvette of GT1 debutants Francesco Pastorelli and Yelmer Buurman with the Sumo Power GT No.21 of David Brabham and Jamie Campbell-Walter.
Marc Basseng and Makus Winkelhock in the All-Inkl Munnich Motorsport Lamborghini No.38, also among the title contenders, failed to progress beyond Q2 and will start this afternoon's Qualifying Race from 10th position.
The sister car of Dominik Schwager and Nicky Pastorelli will start fifth while the Hexis Aston Martins line up in sixth and eighth.
The big news of the day was the retirement overnight of the Young Driver Aston Martin No.8 of Darren Turner and Stefan Mucke, the closest challengers to Krumm and Luhr for the drivers' title.
The car sustained a broken chassis after Mucke struck the wall at T21 in yesterday's Pre-Qualifying thus ending the championship hopes of the pair.
The Qualifying Race starts at 13:45 local time.
Source: GT1 World