Which noted sports personalities retired this year?

Ashish Nehra, whose 6/23 are the best bowling figures for India in World Cup history, called time on his 20-year-long professional career in November. England's all-time leading goalscorer with 53 goals, forward Wayne Rooney retired from national duty. Further, Kaká, the last player apart from Cristiano Ronaldo and Lionel Messi to win the Ballon d'Or, also hung up his boots.