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Monaco GP: Mercedes' secret tyre session tests patience of rivals

Nico Rosberg's brilliant triumph in the Monaco Grand Prix was marred slightly when Red Bull and Ferrari lodged official protests afterwards, seeking clarification of a so-called secret test that Mercedes had undertaken with tyre supplier Pirelli after the Spanish GP earlier this month. There, the silver cars started from the front row of the grid but could not better sixth and 12th places in the race because of very high tyre wear.