AUSTIN, Texas :Oscar Piastri said he still had full confidence in his ability to win the Formula One championship, and no major concerns, despite a tough weekend in Texas that saw rivals slash his overall lead.

The Australian retired from the Saturday sprint after a first corner collision with McLaren teammate Lando Norris and finished fifth in Sunday's main race at Austin's Circuit of the Americas.

Norris is now only 14 points behind, after starting the weekend 22 adrift, while Red Bull's Max Verstappen won both races and is 40 behind Piastri after lagging him by 104 at the end of August.

There are five rounds remaining, with two more sprint races and a maximum 141 points to be won.

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