Valtteri Bottas topped the timesheets on the opening day of practice for the season-ending Abu Dhabi Grand Prix, leading team mate Lewis Hamilton in a Mercedes one-two despite a bizarre collision.

The Finn, who was also fastest in the opening session, improved on his afternoon benchmark with a one minute, 36.256 second lap in the floodlit second session at the Yas Marina track to cement his place at the top of the timesheets. But then he tangled with Romain Grosjean's Haas shortly after in a collision that left him with a broken front wing and other minor damage.