Miami setback for Serena
Serena Williams has withdrawn from the Miami Open because of a left knee injury, while world number one Naomi Osaka was beaten in the third round by Hsieh Su-wei.
Williams had been due to face 18th seed Wang Qiang of China, who defeated Johanna Konta in the second round yesterday.
It is the second successive event from which Williams has pulled out, with the 37-year-old having retired during her third-round clash with Garbine Muguruza in Indian Wells a fortnight ago because of illness.
Williams said: "I am disappointed to withdraw from the Miami Open due to a left knee injury. It was an amazing experience to play at the Hard Rock Stadium this year and I would like to thank the Miami Open for putting on an amazing event."
Meanwhile, Dan Evans' run at the Miami Open ended in a second-round defeat by Canadian teenager Denis Shapovalov.
Evans dropped just two games in a first-round win over Malek Jaziri having earned a place in a draw as a lucky loser and led 20th seed Shapovalov by a set before going down 4-6 6-1 6-3.
It has been a busy and successful start to the season for Evans, who is back in the top 100 less than a year after returning from a one-year ban.
He battled well in the third set but was unable to prevent Shapovalov breaking serve in the third game.