Sauber team principal Monisha Kaltenborn says Sergey Sirotkin is progressing well, as he continues his development programme ahead of his expected F1 debut in March next year.
The 18-year-old has come under some criticism in recent months after Sauber announced their intentions to position him in a race seat for 2014. Adrian Sutil recently said that letting teenagers driving in F1 could be 'dangerous' but Kaltenborn is still convinced by the Russian's talent.
Sirotkin's racing season in Formula Renault 3.5 finished in disappointing style earlier this month after three consecutive retirements. He continues to build his experience with F1 machinery after a demo run for Sauber at the Sochi...
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