Michael Schumacher struggled to make an impact upon his return to Formula 1 with Mercedes because he "let the old man in", according to one of his former rivals.
In the eyes of many fans he remains the greatest driver ever to grace the F1 grid. He enjoyed early success with Benetton where he won back-to-back titles, before leaving for Ferrari where he dominated the championship by winning a further five in a row.
Schumacher retired from the sport at the end of 2006 and spent three years on the sidelines, during which time he injured himself in a motorcycle accident. But he returned to the grid in 2010 and spent three more seasons racing in F1 as he helped to establish the Mercedes name.
