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Valtteri Bottas went quickest for Mercedes in what proved to be an unrepresentative final practice session for Formula 1's 2019 Chinese Grand Prix.

Practice was red-flagged with five minutes remaining when Alexander Albon ran wide at the exit of the final corner and smote his Toro Rosso heavily against the barrier.

Honours had been split in Friday practice as Ferrari's Sebastian Vettel went fastest in the first session and Bottas topped the second, while analysis of long-run times suggested the two teams were closely matched on potential race pace.

But final practice ended with question marks still hanging over the teams' relative performance because the stoppage interrupted the final runs.

After the initial qualifying-simulation runs Vettel was on top with an impressive 1m33.222s, 0.734 seconds ahead of Lewis Hamilton, who was fractionally faster than Bottas, but the Ferrari was running on Pirelli's soft compound while both Mercedes were on the mediums.

Despite being quickest of all through the second sector, Charles Leclerc was only fourth at this point, nearly eighth tenths off his team-mate's pace.

With 10 minutes remaining Leclerc attempted a second run but had only improved to 1m33.248s, third quickest behind Vettel, when the session was stopped.

When the leading group emerged for their second runs with 10 minutes to go, Bottas leapt to the top of the timesheet on soft tyres with a 1m32.830s, faster than Vettel by 0.392s as Vettel had twice run wide on his first flying lap of the run.

The stoppage then put paid to Vettel's attempts to improve his earlier time, and a scruffy lap by Hamilton at the beginning of his second run left the other Mercedes fourth fastest.

Red Bull sat out half the 60-minute session before mobilising. Pierre Gasly was first of its cars to hit the track but his first run, on medium tyres, was scruffy in places and left him outside the top 10. He never got to set a timed lap on soft tyres.

Max Verstappen's first run of 1m34.447s, on soft tyres, was good enough for fifth but a yawning 1.225s away from Vettel's initial benchmark. His attempts to improve were scuppered by the red flag and he ended the session seventh, usurped by Nico Hulkenberg's Renault and Kimi Raikkonen's Alfa Romeo - both getting final soft-tyred runs in before the red flag.

The two Alfa Romeos came close to having a contretemps on the back straight shortly after the half-way mark, after which Raikkonen suggested team-mate Antonio Giovinazzi had deliberately moved over on him.

Albon and Daniil Kvyat had been sixth and seventh for Toro Rosso after the first qualifying simulations on soft tyres and separated by just a tenth. But they were bumped down the order to ninth and 10th in the final reckoning and may even have slumped further had other midfield runners been able to make final runs.

McLaren's Carlos Sainz Jr was one midfielder who got a second run in before the red flag and he ended the session eighth. Team-mate Lando Norris also briefly figured in the top 10 for McLaren but his second run was compromised by an off at the final corner.

Both Racing Points were in the top 10 after the first runs but Sergio Perez and Lance Stroll, like Renault's Daniel Ricciardo, were also stymied by the early stoppage.

Haas drivers Romain Grosjean and Kevin Magnussen languished at the bottom of the timesheets with only the Williams for company for the balance of the session, courtesy of middling-paced initial efforts on medium tyres. The red flag also cost them the opportunity of moving upwards.

Practice three times

Pos Driver Car Time Gap Laps 1 Valtteri Bottas Mercedes 1m32.830s - 11 2 Sebastian Vettel Ferrari 1m33.222s 0.392s 12 3 Charles Leclerc Ferrari 1m33.248s 0.418s 10 4 Lewis Hamilton Mercedes 1m33.689s 0.859s 10 5 Nico Hulkenberg Renault 1m33.974s 1.144s 11 6 Kimi Raikkonen Alfa Romeo/Ferrari 1m34.246s 1.416s 14 7 Max Verstappen Red Bull/Honda 1m34.447s 1.617s 5 8 Carlos Sainz Jr. McLaren/Renault 1m34.510s 1.680s 9 9 Alexander Albon Toro Rosso/Honda 1m34.600s 1.770s 11 10 Daniil Kvyat Toro Rosso/Honda 1m34.783s 1.953s 10 11 Lando Norris McLaren/Renault 1m34.938s 2.108s 11 12 Sergio Perez Racing Point/Mercedes 1m35.078s 2.248s 9 13 Daniel Ricciardo Renault 1m35.142s 2.312s 11 14 Lance Stroll Racing Point/Mercedes 1m35.223s 2.393s 10 15 Pierre Gasly Red Bull/Honda 1m35.326s 2.496s 8 16 Antonio Giovinazzi Alfa Romeo/Ferrari 1m35.726s 2.896s 12 17 Romain Grosjean Haas/Ferrari 1m35.771s 2.941s 14 18 Kevin Magnussen Haas/Ferrari 1m35.998s 3.168s 15 19 George Russell Williams/Mercedes 1m36.124s 3.294s 10 20 Robert Kubica Williams/Mercedes 1m36.176s 3.346s 11



