Michael Schumacher has announced that he will retire from Formula 1 at the end of the season.  McLaren's Lewis Hamilton is to replace the seven-time world champion at Mercedes from next year.   Schumacher was linked with a move to Sauber for next year, but has decided to end an F1 career that began in 1991.  Schumacher won 91 races in 19 seasons, helping to revive Ferrari's fortunes after he joined them in 1996.

BBC Sport