Serena Williams has announced her imminent retirement from tennis.The 23-time grand-slam champion won her first singles match for more than a year at the National Bank Open in Toronto on Monday evening but has revealed in a first-person piece for Vogue that she has decided to end her career."I'm here to tell you that I'm evolving away from tennis, toward other things that are important to me," she wrote.

Serena Williams has announced her imminent retirement from tennis.The 23-time grand-slam champion won her first singles match for more than a year at the National Bank Open in Toronto on Monday evening but has revealed in a first-person piece for Vogue that she has decided to end her career."I'm here to tell you that I'm evolving away from tennis, toward other things that are important to me," she wrote.