Team Phoenix's Mike Rockenfeller has gone fastest during the first free practice session of the weekend in preparation for rounds seven and eight of the DTM at Zandvoort.

The 2013 DTM champion set the session early on in proceedings with a 1 minute 32.009 second lap around the former Grand Prix circuit, narrowly beating BMW's Antonio Felix da Costa, who trailed just eight-thousandths further back from the leading RS5.

While Audi grabbed the headline time with Rockenfeller, BMW look to be a serious threat to the 'four rings' as positions two down to sixth all came in the shape of an M4 machine.

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Team RBM duo of Augusto Farfus and Tom Blomqvist both improved their times very late in the session, which saw the pair rise from the lower echelons of order to third and fifth by the end of the 45-minute running.

Defending DTM champion Marco Wittmann and his Team RMG colleague Maxime Martin were two other M4's in question to make the top-six, underlining BMW's early potential.

As a result of BMW's difficult start to the 2015 campaign, each of the squad's M4 machine carry less of a performance weight penalty in relation to Audi and Mercedes.

The next non-BMW runner in seventh position was Team Phoenix's Timo Scheider. The double DTM champion's time was just eleven-hundredths quicker than Team Abt's Mattias Ekstrom in eighth.

ART Grand Prix's Gary Paffett found himself engulfed within an Audi sandwich as the highest placed Mercedes runner in ninth.

In keeping with the session's close margin's, Team Abt's Edoardo Mortara was a further half-a-tenth behind to complete the FP1 top-ten order.

Current points leader Jamie Green began his quest for that elusive Zandvoort victory further down the timesheets after the Team Rosberg driver set the 14th quickest lap of the session.