MEXICO CITY :Formula One leader Oscar Piastri said his vanishing speed was "a bit of a mystery" after struggling to seventh on the grid in Mexico City Grand Prix qualifying while teammate Lando Norris took pole position.

Norris lapped the Autodromo Hermanos Rodriguez on Saturday with a time 0.6 seconds quicker than the Australian. Ferrari's Charles Leclerc and Lewis Hamilton were second and third.

Piastri qualified eighth but moves up a place thanks to Williams' Carlos Sainz carrying a five-place grid penalty from Austin.

"I'm a bit frustrated with how the session's gone," Piastri told reporters. "There's a lot of things I could worry about, but ultimately, being that far off when you feel like you've done a reasonable job is a difficult place to be."

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