Red Bull's Mark Webber was the fastest in practice for the Belgian Grand Prix.
On a rain-affected session, the Australian posted a quickest lap time of one minute 50.321 seconds, while Ferrari's Fernando Alonso was only 0.140secs behind.
Jenson Button was 0.449secs behind Webber, with Hamilton a further 0.068secs slower.
Qualifying for Spa is tomorrow (Saturday), with the race itself taking place on Sunday.
