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Reigning World Endurance champions Porsche have claimed a one-two in the only practice session ahead of the 84th running of Le Mans 24 Hours with Neel Jani grabbing the top time in a crash-strewn session.

With conditions starting dry before intermittent rain showers reined in some of the top times, the Le Mans runners were treated to the final two hours in sunshine - but track action was punctuated by two separate red flag incidents.

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Despite the stoppages and other minor offs, Jani put the #2 Porsche at the top of the times with a 3m 22.011s inside the final ten minutes before the #6 Toyota collided with the #28 Pegasus Racing which prematurely ended the session.

In between the rain and red flags, Brendon Hartley in the #1 Porsche looked to have set the fastest time until Jani's late flyer, but held on to second spot by four-tenths from the #8 Audi. The two Toyota's split the second Audi in the LMP1 Hybrid battle, as Rebellion Racing comfortably gapped the ByKolles Racing after it suffered an engine fire, promoting the first red flag.

KCMG bite back 12 months on

Despite only running at the test day in 2016, the defending LMP2 champions got its Le Mans weekend off to the perfect start by topping the class by well over half a second from Signatech Alpine.

The Hong-Kong outfit is eyeing up a solid defence its title by has a bumper field of 22 other LMP2 cars to battle against.

Ferrari head the field in GTE-Pro and GTE-AM

Ferrari claimed a clean sweep of top spots in the GT classes with factory AF Corse a hotly-contested field from US Sportscar-based outfit Risi Competizione.

Despite a bump into the barriers towards the end of the session Ford enjoyed a solid return with all four entires inside the top seven of the Pro classification, with the #67 GT taking third.

In Am, Ferrari's dominance was even stronger with the two free spots all held by teams running with Italian manufacturer machines with Clearwater Racing topping the times.