The final part of the second triple-header this season got underway in cool conditions at the Catalunya circuit, with Quartararo setting the early pace on his Yamaha at the scene of his debut MotoGP podium in 2019.
The French rider is battling illness this weekend, but leaped to the top of the order at the start of the session with a 1m41.551s, before bettering that to a 1m41.377s.
Factory Yamaha counterpart Maverick Vinales edged ahead soon after with a 1m41.272s, improving on his next effort to a 1m41.105s as he went out straight away on a full fuel tank to start understanding the feeling of his M1 under race conditions.
Quartararo returned to top spot with a 1m40.872s just over 10 minutes into the session, which stood as the benchmark right up until the closing stages.
And it was the Petronas rider who put it under threat, lighting up the timing screens across the final three sectors of the Catalunya circuit with three minutes to go to post a 1m40.584s.
On his final lap, Quartararo found more time and ended the session with a 1m40.431s, heading Ducati’s Andrea Dovizioso.
The Italian was top Ducati runner in a low-key session for Desmosedici riders, with Dovizioso jumping up to second in the latter stages with a 1m40.861s after fitting a fresh soft rear tyre.
Suzuki’s Mir crashed at Turn 5 in the opening stages, but was soon back out on track and ended the morning third fastest with a 1m31.060s.
Vinales was fourth at the chequered flag ahead of Aleix Espargaro on the Aprilia, with the sister Petronas bike of Franco Morbidelli completing the top six.
The Briton was ninth fastest and top Honda runner in ninth ahead of Tech 3 KTM’s Miguel Oliveira.
Factory KTM counterpart Pol Espargaro was some 1.4s off the pace in 16th, sandwiched between the equally slow-starting Francesco Bagnaia in 15th and his Pramac teammate Jack Miller in 18th, while Danilo Petrucci – who was on the podium at Catalunya last year – was only 19th on his works Ducati.
Iker Lecuona was the only other faller in the session, though the Tech 3 rider still managed a solid 13th in FP1.
Catalan GP - First practice results:
|1|| Fabio Quartararo ||Yamaha||1'40.431|
|2|| Andrea Dovizioso ||Ducati||1'40.861||0.430|
|3|| Joan Mir ||Suzuki||1'41.060||0.629|
|4|| Maverick Viñales ||Yamaha||1'41.105||0.674|
|5|| Aleix Espargaro ||Aprilia||1'41.195||0.764|
|6|| Franco Morbidelli ||Yamaha||1'41.219||0.788|
|7|| Alex Rins ||Suzuki||1'41.316||0.885|
|8|| Valentino Rossi ||Yamaha||1'41.536||1.105|
|9|| Cal Crutchlow ||Honda||1'41.549||1.118|
|10|| Miguel Oliveira ||KTM||1'41.592||1.161|
|11|| Takaaki Nakagami ||Honda||1'41.609||1.178|
|12|| Johann Zarco ||Ducati||1'41.625||1.194|
|13|| Iker Lecuona ||KTM||1'41.640||1.209|
|14|| Bradley Smith ||Aprilia||1'41.643||1.212|
|15|| Francesco Bagnaia ||Ducati||1'41.790||1.359|
|16|| Pol Espargaro ||KTM||1'41.833||1.402|
|17|| Stefan Bradl ||Honda||1'41.969||1.538|
|18|| Jack Miller ||Ducati||1'42.026||1.595|
|19|| Danilo Petrucci ||Ducati||1'42.059||1.628|
|20|| Alex Marquez ||Honda||1'42.061||1.630|
|21|| Brad Binder ||KTM||1'42.335||1.904|
|22|| Tito Rabat ||Ducati||1'42.992||2.561|
|View full results|