Venus Williams is the latest name to withdraw from the 2013 Sony Open in Miami, pulling out of the tournament with a back injury prior to her third round clash with Sloane Stephens.

Serena and Venus Williams have both withdrawn from next week's China Open in Beijing.

Venus Williams takes on Angelique Kerber tonight in the second round of the 2012 US Open (02:00 BST start).

Venus Williams takes on fellow American Bethanie Mattek-Sands later today in the first round of the 2012 US Open (20:00 BST start).

Venus Williams takes on Na Li today this evening in the semi-finals of the Western and Southern Open in Cincinnati (00:00 BST start).

Venus Williams takes on Sam Stosur this afternoon in the quarter-finals of the Western and Southern Open in Cincinnati (18:00 BST start).

Venus Williams takes on Sara Errani this afternoon in the third round of the 2012 Western and Southern Open in Cincinnati (19:00 BST start).

Venus Williams takes on Chanelle Scheepers this afternoon in the second round of the 2012 Western and Southern Open in Cincinnati (19:00 BST start).

Venus Williams takes on Maria Kirilenko today in the first round of the Western and Southern Open in Cincinnati (16:00 BST start).

Serena and Venus Williams take on Maria Kirilenko and Nadia Petrova of Russia this afternoon in the semi-finals of the women's doubles at the London 2012 Olympic Games (16:30 BST start).

Defending champions Serena and Venus Williams take on Italian second seeds Sara Errani and Roberta Vinci this afternoon in the quarter-finals of the women's doubles at the London 2012 Olympic Games (15:30 BST start).

Olympic champions Serena and Venus Williams begin their doubles campaign at the London 2012 Olympic Games this afternoon when they take on German fifth seeds Angelique Kerber and Sabine Lisicki (14:00 BST start).

Three-time Olympic gold medallist Venus Williams takes on Canada's Aleksandra Wozniak this afternoon in the second round of the women's singles at the London 2012 Olympic Games (12:00 BST start).

Three-time Olympic champion Venus Williams kicks off her London 2012 campaign this afternoon when she takes on Sara Errani at Wimbledon (13:00 BST start).

Venus Williams takes on Elena Vesnina this afternoon in the first round of Wimbledon 2012 (13:00 BST start).

Maria Sharapova takes on Venus Williams this afternoon in a blockbuster quarter-final clash at the Internazionali BNL d’Italia (14:00 BST start).

Venus Williams takes on Samantha Stosur this afternoon in the third round of the Internazionali BNL d’Italia (12:30 BST start).

Venus Williams takes on Ekaterina Makarova this afternoon in the second round of the 2012 Internazionali BNL d’Italia (14:30 BST start).

Venus Williams takes on Simona Halep this afternoon in the first round of the 2012 Internazionali BNL d’Italia (13:00 BST start).

Venus Williams takes on Angelique Kerber tonight in the second round of the Mutua Madrid Open (19:30 BST start).

Venus Williams takes on Anastasia Rodionova this afternoon in the third round of the Family Circle Cup (19:30 BST start).

Venus Williams takes on Jelena Jankovic tonight in the match of the day at the Family Circle Cup in Charleston (00:00 BST start).

Venus Williams takes on Agnieszka Radwanska this afternoon in the quarter-finals of the Sony Ericsson Open in Miami (18:00 BST start).

Venus Williams takes on Ana Ivanovic tonight in the fourth round of the 2012 Sony Ericsson Open in Miami (02:00 BST start).

Venus Williams takes on Aleksandra Wozniak this afternoon in the third round of the Sony Ericsson Open (18:00 BST start).

Petra Kvitova takes on Venus Williams tonight in the second round of the Sony Ericsson Open in Miami.

Venus Williams takes on Kimiko Date-Krumm this afternoon in the first round of the 2012 Miami Masters.

Venus Williams has vowed to return to tennis after withdrawing from the US Open after being diagnosed with Sjogren's Syndrome.

Venus Williams has been forced to pull out of the US Open due to illness after revealing she is suffering from Sjogren's Syndrome.