Sutton Images Enlarge Sauber test driver Sergey Sirotkin says he does not think Simona de Silvestro is a credible threat to his chances of landing a race seat as he believes she is at the team for marketing purposes only. Sirotkin, 18, looked set at one point last year to be handed a race seat as part of Sauber's partnership with Russian investors and technology companies, but had to settle for a test drive instead so he could continue to compete in Formula Renault 3.5. Silvestro's test for Sauber earlier this year fuelled speculation she may be the first woman to enter an F1 world championship since Giovanna Amati in 1992, but Sirotkin does not believe his chances have been hampered....
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