Daniel Ricciardo set the early pace in Hungary with an upgraded Red Bull, as Antonio Giovinazzi and Jolyon Palmer both caused red flags.
The Aussie set a 1:18.486 on soft tyres, just five hundreths of a second slower than the fastest outright lap set by Rubens Barrichello in 2004. Kimi Raikkonen was two tenths off the pace in second, with Lewis Hamilton a tenth further back in third.
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After Jolyon Palmer and Stoffel Vandoorne both suffered early offs, there was an initial reluctance to put some laps down on a very green and dusty track.
The wind also began to whip up, forcing Turn 11 to catch a few drivers out. The first of which was Romain Grosjean, who suffered rear wing damage after colliding with the tyre wall.
But, it was reserve driver Antonio Giovinazzi in the other Haas that would suffer the biggest crash, crushing the front left of the car into the barrier and prompting the red flags to wave.
Given Sauber's new multi-year deal with Ferrari, rumours are circulating that Ferrari test driver Giovinazzi will have a full-time seat in 2018, but he is not doing himself any favours after also suffering two other hefty crashes in China earlier on in the season.
After the session was briefly red-flagged, it was Hamilton who looked to be setting the early standard, but Ricciardo started to dial in and wipe away the Brit's advantage.
Meanwhile, Sebastian Vettel struggled throughout with a lack of grip and could only finish a second off the pace in P6, with Valtteir Bottas one place further up and Max Verstappen settling for P4.
Both McLaren-Honda cars were in the top 10 on a track which is expected to suit them, so too were both Renault drivers.
But, for Jolyon Palmer, there was yet more on-track drama in the final minute of the session. On the exit of Turn 4, the raised kerb took his front wing clean off and left a whole lot of debris for the stewards to clear up ahead of FP2.
?RED FLAG ?
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1 Daniel Ricciardo Red Bull 1:18.486 (SS)
2 Kimi Raikkonen Ferrari 1:18.720 0.234 (SS)
3 Lewis Hamilton Mercedes 1:18.858 0.372 (SS)
4 Max Verstappen Red Bull 1:19.162 0.676 (SS)
5 Valtteri Bottas Mercedes 1:19.248 0.762 (SS)
6 Sebastian Vettel Ferrari 1:19.563 1.077 (SS)
7 Fernando Alonso McLaren 1:19.987 1.501 (SS)
8 Stoffel Vandoorne McLaren 1:20.005 1.519 (SS)
9 Nico Hulkenberg Renault Sport 1:20.150 1.664 (SS)
10 Jolyon Palmer Renault Sport 1:20.461 1.975 (SS)
11 Felipe Massa Williams 1:20.540 2.054 (SS)
12 Sergio Perez Force India 1:20.574 2.088 (SS)
13 Daniil Kvyat Toro Rosso 1:20.780 2.294 (SS)
14 Carlos Sainz Toro Rosso 1:20.917 2.431 (SS)
15 Lance Stroll Williams 1:20.974 2.488 (SS)
16 Romain Grosjean Haas 1:21.313 2.827 (S)
17 Alfonso Celis Force India 1:21.602 3.116 (SS)
18 Marcus Ericsson Sauber 1:21.785 3.299 (SS)
19 Antonio Giovinazzi Sauber 1:22.251 3.765 (S)
20 Pascal Wehrlein Sauber 1:22.490 4.004 (SS)
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