The factory #6 Porsche Penske 963 of Laurens Vanthoor was circulating a few seconds clear of the #8 Toyota GR010 HYBRID driven by Ryo Hirakawa after 18 hours of racing at Le Mans, with marshals still replacing the barriers at Indianapolis under the caution period.
Heart of Racing driver Daniel Mancinelli was being lapped by the #51 Ferrari LMH car when the Italian lost control of the #27 Aston Martin Vantage GT3 on his own and slammed heavily into the barriers, with his car going airborne and landing upside down on the track.
Mancinelli walked away unscathed from the crash, but the safety car had to be deployed to recover the car and replace the tyre barriers at the inside of the banked left-hander.
The #6 Porsche of Vanthoor was leading the race by 18s when the safety car bunched the field back up, having jumped the #8 Toyota in the previous round of pitstops.
Ironically, it was a crash for the sister #4 Penske car that helped Vanthoor circle into the lead, with the Belgian pitting under a slow zone caused when Felipe Nasr lost the rear-end of his 963 on slick tyres into Indianapolis. The incident put the additional Penske-run IMSA entry out of the race, with Nasr getting out of the car due to heavy damage.
The #8 Toyota had been leading the Hypercar class until that point, with Hirakawa having made a clean restart in the 17th hour after the racing finally resumed after a four-hour safety car period.
#8 Toyota Gazoo Racing Toyota GR010 – Hybrid: Sebastien Buemi, Brendon Hartley, Ryo Hirakawa
Photo by: Alexander Trienitz
Hirakawa had pitted a few laps before Nasr’s off in green conditions, but was still running a comfortable second ahead of the sister #7 car driven by Nyck de Vries.
De Vries was the first Hypercar runner to switch to slick tyres as he was already due to make a pitstop, having been running out of kilter with its rivals. However, that also meant that he had to return to the pitlane under the safety car for more fuel and dropped down the order.
The #2 Cadillac was the main beneficiary as Earl Bamber assumed third place, but he is yet to complete his pitstop. Fourth place is being held by the #5 Porsche of Frederic Makowiecki, who fended off Robert Shwartzman in the #83 AF Corse Ferrari before the safety car period.
The #50 Ferrari of Antonio Fuoco was running right behind the duo and continues to hold sixth, ahead of the #7 Toyota now driven by de Vries’ team-mate Kamui Kobayashi.
The LMP2 class featured a number of changes in the last three hours, as the order shuffled during every pitstop phase.
At the end of hour 18, Ben Barnicoat was back in front in the #183 AF Corse ORECA, ahead of the #22 United Autosports car now driven by Oliver Jarvis.
#3 Cadillac Racing Cadillac V-SeriesR: Sebastien Bourdais, Renger Van Der Zande, Scott Dixon, #183 AF Corse Oreca 07: Gibson: Francois Perrodo, Ben Barnicoat, Nicolas Varrone
Photo by: Alexander Trienitz
Vector Sport also made headways after putting platinum-rated Patrick Pilet in the car, while the #37 Cool Racing dropped to fourth as Lorenzo Fluxa took over.
In LMGT3, the class-leading #92 Manthey PureRxcing Porsche 911 GT3 R dropped out of contention with gearbox issues, as Klaus Bachler brought the car into the garage shortly after the race went green again. It took 24 minutes for the German squad to fix the problem, which meant it lost five laps and in the lower regions of the top 20.
The sister #91 Manthey EMA Porsche of Richard Lietz took over the baton from Bachler, but dropped to third late in the 18th hour after making a pitstop.
That put Gregoire Saucy ahead in the #59 United Autosports McLaren 720S GT3, ahead of the #87 ASP Lexus RC F GT3 of Jack Hawksworth.