Venus wins 47th career title

Venus Williams won her biggest title in five years at the Wuhan Open on Saturday, after Garbine Muguruza retired making her the fifth player to pull out mid-match in the late-season tournament.

Williams took the first set and was three points up when the Spaniard stopped play at 53 minutes, handing the American veteran the 47th title win of her career, and her first victory at a WTA Premier Five event since she beat Victoria Azarenka in 2010 in Dubai.

Wimbledon finalist Muguruza -- ranked world number eight, 15 places ahead of American veteran Williams -- had a tough semi final against Germany's Angelique Kerber, winning in straight sets but falling during the closing tie break and injuring her ankle.

But the 21-year-old said it was exhaustion not injury that made her pull out.

Williams, who turned pro the year that Muguruza was born, was also struggling during the final with leg pain and had both of her thighs wrapped.

She had a gruelling semi-final the day before against her sister Serena's nemesis Roberta Vinci, and conceded that she would have had a tough match against Muguruza if her young opponent had been on form.

The title win will put Williams back in the top 20 when the new rankings are released on Monday, after entering Wuhan as number 23.

The former world number one was diagnosed with an autoimmune disease in 2011, and while she continued to play some tournaments, she has struggled with her health and slipped down the rankings.

Williams could now qualify for the season-ending WTA championships in Singapore, which she has not reached since 2009.