Championship contender Chaz Mostert has shrugged off an early in-car water leak to finish fastest of the four remaining contenders in Thursday’s first Supercars practice.

While young hopeful Kai Allen had a 215km/h near-miss that would have thrown his own title dreams into chaos.

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But it was Cam Waters who took honours across the field, as he trumped David Reynolds for the fastest lap at Adelaide’s street circuit.

Mostert, one of four title contenders alongside Allen and Red Bull Racing duo Broc Feeney and Will Brown, has never claimed a Supercars championship – instead he’s a three-time third place getter.

But under the new finals system, Mostert remains a massive chance to break his title drought.

He finished sixth fastest in the first practice, followed by Brown in seventh.

No donuts for second place? | 00:10

Feeney could only manage 11th as he hopes to achieve his maiden Supercars crown after an impressive 2025 season that’s included 16 pole positions.

But Allen copped the biggest scare of all four remaining contenders as he had to take evasive action to avoid Andre Heimgartner late in practice.

Supercars commentator Garth Tander described it as “heart in mouth” for Allen who registered the 18th fastest time.

It was Allen flying down toward turn 1 at 215km/h when Heimgartner exited from pit lane. But it was there he sat in Allen’s racing line before a last second move was made to avoid contact.

“That could have been a very high speed nasty moment,” Fox Motorsport’s Neil Crompton said.

“That is proper spooky!

“Could have been an aeroplane crash on the pit lane exit … Holy smoke!”

Supercars great Mark Skaife described Allen arriving at “warp speed” before he had to narrowly avoid Heimgartner.

“When you get down to turn 1, you’re doing 215km/h – the speed coming out of the pits is 70-80km/h at that point,” he shared.

“That is out of control.

“That is so close!

The moment Andre Heimgartner crawled out in front of Kai Allen coming in at 215km/h.Source: FOX SPORTS

“(Andre) had a quick look in the rear view mirror and saw Kai arriving … There’s some sliding door moments in car racing – that was one there.

“A get out of jail free card there for Kai.”

Tander said Heimgartner’s best play would have been to remain in the pit exit before rejoining behind Allen – rather than pulling out in front.

Luckily for both drivers, no contact was made.

Feeney himself narrowly avoided his own disaster after running wide at Turn 7.

Supercars return to the track on Friday morning for Practice 1 at 10:30am local/11:00am AEDT, followed by Boost Mobile Qualifying at 12:40pm local/1:10pm AEDT. Tickets for the event are on sale.