Max Verstappen beat Charles Leclerc to Miami Grand Prix Sprint pole as Mercedes suffered a dismal start to the weekend with a double early exit.
Verstappen struggled with his Red Bull throughout the session, including on the lap that he secured pole with, but the other contenders fell away to leave the world championship leader at the top of the timesheet.
Ferrari's Leclerc recovered from missing most of the weekend's only practice session earlier on Friday to take second as he finished a tenth back from the Dutchman.
Lando Norris had appeared the most likely driver to deny Verstappen pole having topped SQ1 and SQ2 in his significantly upgraded McLaren but the Brit will only start ninth after struggling in SQ3.
Verstappen's team-mate Sergio Perez took third, while Daniel Ricciardo claimed a hugely impressive fourth for Red Bull's junior team RB as the Australian fights for his future in the sport.
Carlos Sainz was fifth for Ferrari ahead of McLaren's Piastri, while Lance Stroll claimed a rare qualifying victory over Aston Martin team-mate Fernando Alonso as they took seventh and eighth, respectively.
Mercedes, who also brought upgrades to the Miami International Autodrome, continued their dismal start to the season as both George Russell and Lewis Hamilton were knocked in SQ2.
More to follow...
Sky Sports F1's live Miami GP schedule
Saturday May 4
3.25pm: F1 Academy Qualifying
4pm: Miami GP Sprint (race starts at 5pm)
6.30pm: Ted's Sprint Notebook
7.05pm: F1 Academy Race 1
8pm: Miami GP Qualifying build-up*
9pm: Miami GP Qualifying*
11pm: Ted's Qualifying Notebook*
Sunday May 5
6.05pm: F1 Academy Race 2
7.30pm: Grand Prix Sunday Miami GP build-up*
9pm: The MIAMI GRAND PRIX*
11pm: Chequered Flag: Miami GP reaction*
Midnight: Ted's Notebook*
*also live on Sky Sports Main Event
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