Valtteri Bottas completed a sweep of Portuguese Grand Prix practice on Saturday with Mercedes team mate and Formula One championship leader Lewis Hamilton second fastest.


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The Finn, quickest in both Friday`s sessions at the Algarve circuit near the southern city of Portimao, lapped with a best effort of one minute 16.654 seconds.


Hamilton, the six-time world champion who can take an outright record 92nd career win on Sunday after equalling Michael Schumacher`s milestone, was 0.026 slower on a sunny but cool morning.


Both drivers made errors, with Hamilton tracking through the gravel at one point.


Red Bull`s Max Verstappen was third fastest, 0.158 off the pace, with AlphaTauri`s Pierre Gasly -- whose car caught fire on Friday -- fourth on the timesheets.


The session was ended a minute early after a drain cover came loose at the exit of turn 14 as Sebastian Vettel`s Ferrari went over it.


Mercedes have qualified on pole for every race so far this season and look set to extend that run to 12 in a row later on Saturday.


The team can also clinch a record seventh successive constructors` title on Sunday if results go their way, although Red Bull`s form is likely to keep them waiting at least another week.


Hamilton is 69 points clear of Bottas after 11 races.