DTM rookie Nico Muller has topped an Audi practice whitewash at Zandvoort as the 'four-ringed' RS5's hold the front-four positions ahead of qualifying.

BMW had the led the way in the opening practice of the day, courtesy of the newly crowned champion, Marco Wittmann's 1 minute 32.002 second lap, but Muller and Audi hit back in some fashion in FP2 as the RS5 monopolised the top of the timesheets.

Muller's 1 minute 31.607 second lap around the Zandvoort Circuit was good enough to beat outgoing champion Mike Rockenfeller by a mere six-hundredths of a second.

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Abt's Edoardo Mortara and Rosberg's Jamie Green followed in close pursuit as just under two-tenths of a second separate the Audi top four.

Timo Glock was 'best of the rest' in fifth for MTEK BMW while Christian Vietoris was the best placed Mercedes in sixth, only three-tenths off the ultimate pace.

Next up was the Abt run Adrien Tambay RS5 in seventh ahead of BMW's Bruno Spengler, who found himself as the meat in an Audi sandwich in eighth with Mattias Ekstrom and Timo Scheider rounding out the top ten in ninth and tenth.

Paul di Resta and Gary Paffett remain within a second of the front-running pace but find themselves down in 16th and 18th for Mercedes.