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Mercedes drivers Lewis Hamilton and Nico Rosberg top final practice at Russian Grand Prix

  • Mercedes driver Lewis Hamilton of Britain steers his car as a local paramilitary member patrols a bridge, during the second free practice at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Friday, Oct. 10, 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Luca Bruno) (AP Photo/Luca Bruno)

    Mercedes driver Lewis Hamilton of Britain steers his car as a local paramilitary member patrols a bridge, during the second free practice at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Friday, Oct. 10, 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Luca Bruno) (AP Photo/Luca Bruno)  (The Associated Press)

  • Mercedes driver Lewis Hamilton of Britain steers his car during the third practice session at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Saturday, Oct. 11 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Ivan Sekretarev)

    Mercedes driver Lewis Hamilton of Britain steers his car during the third practice session at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Saturday, Oct. 11 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Ivan Sekretarev)  (The Associated Press)

  • Mercedes driver Lewis Hamilton of Britain, removes a part of his car after setting the qualifying session at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Saturday, Oct. 11, 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Luca Bruno)

    Mercedes driver Lewis Hamilton of Britain, removes a part of his car after setting the qualifying session at the 'Sochi Autodrom' Formula One circuit , in Sochi, Russia, Saturday, Oct. 11, 2014. The inaugural Russian GP will be held on Sunday in Sochi, the Black Sea resort that hosted this year's Winter Olympics. (AP Photo/Luca Bruno)  (The Associated Press)

Formula One championship leader Lewis Hamilton edged Mercedes teammate Nico Rosberg in the final practice Saturday for the Russian Grand Prix.

Williams driver Valtteri Bottas was third in the last session ahead of qualifying, ahead of Red Bull's Daniel Ricciardo and Felipe Massa in the second Williams.

Hamilton also had the fastest time in Friday's practice. On Saturday, he drove the fastest lap of 1 minute, 38.726 seconds, beating Rosberg by .290 seconds.

Bottas was .371 seconds behind, while Ricciardo lagged 1.029 seconds.

Hamilton may have had an even faster time but for a spin late in the session. He then headed into the pit lane.

Mercedes can wrap up its first constructors title if one of its drivers wins Sunday's race. Hamilton can stretch his 10-point leader over Rosberg.