Sergey Sirotkin (RUS) Sauber C33. Formula One Testing, Day One, Bahrain International Circuit, Sakhir, Bahrain, Tuesday, 8 April 2014
The 19-year-old Russian, who acts as Sauber’s test driver, has already driven on part of what is his home Grand Prix circuit in Sochi, having completed promotional running in a 2012 Sauber C31 in September last year.
Sirotkin joined Sauber in August 2013 and was in line for a race seat with the Swiss team for 2014, but they instead opted to retain Esteban Gutierrez in their driver line-up.
He has prior experience of the Ferrari-powered C33 having completed 76 laps behind the wheel on the first day of the this year's in-season test at Bahrain.
Sauber have regularly rotated their driver line-up on a Friday, with test and reserve driver Giedo van der Garde having made seven FP1 appearances over 13 Grands Prix so far in 2014.