LONDON (AP) — Nico Rosberg stunned the world of Formula One and beyond by announcing his retirement on Friday at the age of 31, five days after winning his first drivers’ championship.
Here are some other sports stars who retired at a young age:
BJORN BORG (TENNIS)
Borg retired at the beginning of 1983, aged just 26. Considered to be one of the greatest tennis players of all time, the Swede won Wimbledon five times in a row and also claimed six French Open titles.
Borg failed to win the US Open in 10 tries, losing four finals — 1976 and 1978 to Jimmy Connors, and 1980 and 1981 to McEnroe.
He played only one tournament in 1982, reaching the quarterfinals in Monte Carlo, before announcing he was quitting the game.
ROCKY MARCIANO (BOXING)
Marciano had been the world heavyweight champion for four years and won all 49 of his fights — 43 by knockout — when he retired in 1956 at the…