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The title gap blew out to 62 points with three rounds remaining and 86 points still to be won.
Formula One leader Max Verstappen was twice penalised for clashes with title rival Lando Norris and finished sixth.
Verstappen's podium finish left him 57 points clear with five rounds remaining.
Toyota Gazoo Racing will become Haas' official technical partner with both parties sharing expertise, knowledge and resources.
The 46-year-old, who was participating in the Rally of Morocco for the second time, crashed in the dunes.
It was the McLaren driver's third career GP win.
Verstappen has now failed to win any of the last six GPs after claiming the honours in seven of the first 10.
Italian Antonelli, who has won one sprint and one feature race for Prema Racing in Formula Two this year, will join George Russell at Mercedes, with Hamilton switching to Ferrari.
The British team announced on Tuesday that Argentine F2 driver Franco Colapinto would replace Logan Sargeant for the remaining nine races of the season, starting with Sunday's Italian Grand Prix at Monza.
It was the first time since the race returned to the calendar in 2021 that Verstappen had not triumphed at Zandvoort and extended his losing streak this season to five races.
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