Hamilton was coming through the field on an alternate tyre strategy, attacking McLaren's Piastri for eighth on his fresher mediums on lap 41.
Hamilton passed Piastri on the inside of the second chicane, but squeezed the Australian towards the grass, his right rear tyre making contact with Piastri's front wing. After both drivers took to the escape road Piastri had to pit for a new front wing, losing a points finish.
