The 20-year-old Russian will join Mercedes' race driver Valtteri Bottas in action at Barcelona this week, although the day he drives depends on the team's programme.<br>It will be Mazepin's first run in the team's 2019 challenger, the W10, although he is conducting a private testing programme this year in a 2017 Mercedes.<br>Mazepin finished runner-up in the final season of GP3 last year, winning ...
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