Nico Rosberg led a Mercedes one-two in the Australian Grand Prix first practice session in Melbourne Friday morning.
The German and his teammate Lewis Hamilton were split by just 0.029s at the flag – while Bottas in third was 1.1s down the road.
Third fastest was Williams driver Valtteri Bottas, ahead of rookie Carlos Sainz Junior racing for Toro Rosso.
Toro Rosso duo Carlos Sainz and Max Verstappen were the busiest drivers as both completed 30 laps and ended up fourth and sixth quickest respectively.
Sebastian Vettel and Kimi Raikkonen were fifth and eighth respectively in their Ferraris, while Bottas’ team-mate Felipe Massa ended up seventh.
Pastor Maldonado was ninth, while his Lotus team-mate Romain Grosjean completed just five laps.
Red Bull’s Daniel Ricciardo was 10th fastest in front of his home fans.
McLaren’s troubles continued as the duo managed just 13 laps in total, with Button and Magnussen 14th and 15th respectively. The Woking based squad forced to end session early thanks to problems with its power unit.
Manor GP duo Roberto Merhi and Will Stevens also leave out the first practice session and Sauber F1 team fail to do any running during opening practice session, their court battle with Giedo van der Garde is ongoing.