Emma Raducanu to face Serena Williams for first time in final US Open warm-up

The soon-to-retire Serena Williams has emerged as Emma Raducanu's next challenge as the Briton prepares to defend her US Open title.

The world No 10 has been drawn to face Williams in the first round of the Western and Southern Open in Cincinnati, which begins with qualifying this weekend and is likely to be the American's final tournament before the US Open.

The 23-time grand-slam champion this week indicated she would retire after contesting Flushing Meadows, saying she was "evolving away from tennis, toward other things that are important to me".

"As I said in the article, I'm terrible at goodbyes. But, goodbye Toronto," a tearful Williams told the National Bank Open crowd after losing in straight sets to Belinda Bencic in the second round.

Raducanu, 19, went home a round earlier in Toronto, with her 7-6 (0), 6-2 defeat to defending champion Camila Giorgi following a quarter-final loss to Liudmila Samsonova at Washington's Citi Open.

Monday's match is the first meeting between Raducanu and Williams and comes 23 years since the latter won the US Open for the first time, also as a teenager.

The winner of the first-round encounter will next face either Victoria Azarenka or Kaia Kanepi.

Dan Evans has reached his second ATP Masters semi-final after fighting his way back at the National Bank Open.

American Tommy Paul had a blistering start to take the first set, but the British No 2 took charge in the second to push ahead for a 1-6, 6-3, 6-4 victory.

"You wonder if it's going to happen, if you are going to get into the match, and I got in," said Evans.

"When I got ahead I really took it to Tommy and that's been sort of my way throughout this week so far, and I went about it in a good way, I was fired up and I thought it was