Heavy rain in Austin, Texas has caused the US Formula One qualifying to be postponed until Sunday.
Lewis Hamilton could take his third world championship after Sunday's race, if he scores nine points more than Ferrari's Sebastian Vettel and two more than Mercedes team mate Nico Rosberg.
Final practice was run earlier, when the rain was less intense, without spectators being allowed in for safety reasons. Retired triple champion Niki Lauda, now a non-executive chairman for Mercedes, said: "The rain is so hard that no wet tyre can take the cars round safely."
The mayor of Houston said up to 10 inches of rain were expected and weather permitting, the qualifying would resume at 9am local time tomorrow.
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Final practice at the Russian Grand Prix has been abandoned following a crash involving Toro Rosso driver Carlos Sainz.
Sainz's Toro Rosso was pictured submerged in the tyre barrier at the high-speed turn 13 section of the track which runs through Sochi's Olympic Park.
The red flags were deployed and with 14 minutes remaining the decision was taken not to restart the session.
Sainz, 21, was attended to by medical staff at the scene of the crash. Toro Rosso team principal Franz Tost told Sky Sports F1 the driver was "conscious" and that a decision would be taken later on whether he could play any further part in the race weekend.
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Sebastian Vettel had to contend with a crazed track invader and two safety cars before claiming his third victory of the season at an incident-packed Singapore Grand Prix.
The Ferrari driver slashed the gap to Lewis Hamilton in the championship after the Briton suffered his first retirement of the year.
Red Bull's Daniel Ricciardo finished second with Ferrari's Kimi Raikkonen completing the podium places. Nico Rosberg, Hamilton's closest rival in his quest for back-to-back titles, crossed the line in fourth.
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