At the end of this season's Vuelta a Espana, Alberto Contador (Trek-Segafredo) will retire. Having won seven Grand Tours in his 15-year career, the Spaniard will close out his career attempting to win a fourth Vuelta title.
Contador announced his retirement on his Instagram page after also confirming he would be riding his final Vuelta. Speculation surrounded Contador's future after a lacklustre Tour de France that saw him finish ninth, his worst finish since 2005.
At 34-years old, the Spaniard has been one of the most successful Grand Tour winners of all time, being only one of two riders to have won all Grand Tours more than once. Contador is also the last rider to have won two Grand Tours in one season, taking the 2008 Vuelta and Giro d'Italia.
A tenacious rider, Contador has gone head-to-head with various rivals over his career including Andy Schleck, Chris Froome and Lance Armstrong.
Contador was no stranger to controversy either, having served a ban for doping that also saw him stripped of his 2011 Giro d"Italia and 2010 Tour de France.