Overnight rain left the track damp and greasy for the early part of the day, but the conditions soon improved sufficiently enough for drivers to switch to slick tyres.
Factory Lamborghini racer Bortolotti was the first driver to break the 1m40s barrier in his Grasser Racing Huracan GT3, moving to the top of the timesheets with a 1m39.201s.
This would remain the quickest time of the morning session, with Porsche ace Laurens Vanthoor coming closest to beating the Italian driver with his effort of 1m39.532s.
After the track action resumed following a two-hour break, Bortolotti lowered his own benchmark by almost a second, posting a time of 1m38.644s to maintain his stranglehold on the top spot on the timesheets.
However, Bortolotti’s reign ultimately proved to be short-lived as Muller managed to go even quicker just 10 minutes later, setting a time of 1m38.532s in his Team Rosberg-run Audi R8 LMS GT3.
Although this lap was fractionally slower than Audi stablemate Marius Zug’s…
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