The Australian, leading the championship from Norris by 31 points, managed 13 laps in the session compared with the 18 of the Briton.
Norris ended up 0.310 seconds quicker than Piastri, with Leclerc 0.552secs off the pace.
Red Bull’s Max Verstappen looked on target to get into the mix at the front on a lap late in the session, only to lock a wheel in the tricky downhill braking zone into Turn 15 and spear into the escape road.
Verstappen ended the session seventh fastest, behind Williams’ Alex Albon and the Dutchman’s Red Bull team-mate Yuki Tsunoda.
Williams’ Carlos Sainz, whose car dislodged the rubber under the Turn 16 kerb, was eighth fastest, ahead of the two Racing Bulls of Liam Lawson and Isack Hadjar.
Hamilton’s incident came at Turn Three, where he clipped the inside kerb after misjudging his turn-in. Until that point, he had been about 0.2secs off Leclerc, but he ended the session 0.831secs off his team-mate.
