Former F1 racer David Coulthard says he feels Paul di Resta needs to secure a test and reserve role with Mercedes to keep his dreams of one day returning to the F1 grid alive.The Scot was left without a drive after being dropped by Force India at the end of the 2013 campaign and will make a return to the DTM this year with Mercedes instead.Rumours persist that di Resta's deal with Mercedes could be expanded to include a reserve role with its F1 team alongside Nico Rosberg and Lewis Hamilton and Coulthard said that such a position could be key if di Resta hopes to make it back onto the grid in future.“I can definitely see an opportunity for Paul there, because Mercedes motorsport boss...
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