Several Grands Prix were cancelled or postponed after the planned opening round in Australia was called off two days before the race was due to take place; prompting the FIA to draft a new calendar.
Ferrari's Sebastian Vettel and AlphaTauri's Daniil Kvyat were slower than their teammates and failed to make it out of the second segment.
The Renault cars had looked fast in practice but Daniel Ricciardo could only manage thirteenth place while Ocon was fifteenth.
Lap times were slower than those in qualifying for the 2019 Spanish Grand Prix because of the hot August weather.
Bottas then used the drag reduction system on the fifth lap to pass Stroll and move back up into third place.
[11] Leclerc's teammate Sebastian Vettel finished seventh after driving for more than half the race distance on one set of soft tyres.