Former British number one Johanna Konta announced her retirement from tennis on Wednesday. The 30-year-old has struggled with persistent knee trouble over the past couple of seasons and has slipped to 113 in the world rankings -- a far cry from her career-high of number four.

Former British number one Johanna Konta retires from professional tennis

Karolina Pliskova donated $100 of her prize money to benefit sick children

Australian Open: Pliskova, Muguruza, Konta enter second round

Johanna Konta's win is the biggest title won by a British woman in four decades

Konta beats Wozniacki to lift maiden Miami title

The Australian-born 25-year-old broke Williams in the first game, and played aggressively throughout the opening set

Tennis: Britain's Konta downs Venus Williams to reach Miami final

French duo of Jo-Wilfried Tsonga and Gael Monfils also entered the quarter-finals of the year's last grand slam

US Open: Wozniacki beats Keys to book last 8 spot

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