Anastasija Sevastova beat US Open champion Naomi Osaka 6-4, 6-4 on Saturday to reach the China Open final. Asked at the post-match press conference, where she again looked unhappy, why she had had tears in her eyes on court, she replied curtly, "Because it was a hard match".
Wozniacki claimed her first China Open title in 2010 when she jumped to top the WTA rankings for the first time.
The first set started very close, while Sevastova managed to break the serve to the US Open champion to have a 4-3 lead, allowing her to gain confidence, reports Efe news. She then relied on this ability to counterpunch from the baseline throughout the match, converting every single one of her break points and getting 84 percent of her returns in play.
The Argentine top seed Del Potro will face either Britain's fifth seed Kyle Edmund or unseeded Nikoloz Basilashvili of Georgia.
The Latvian said she had sustained the problem in her win over Croatia's Donna Vekic in the last 16.
"I also want to thank and apologise to Anastasija for today".
The 28-year-old is now just one victory away from her fourth - but biggest - WTA title of her career in Beijing.
"Unfortunately, I have been playing through pain in my back this whole week", the world number six said in a subsequent statement released by organisers.
"Then if you win one Grand Slam, they're like, 'Oh, she only won one Grand Slam'".
"I think I had a dream of that, but I don't know how realistic I really believed that was going to be".
Chris Gayle to miss T20I and ODI series against India
Deciding to bowl Kuldeep Yadav in the second test despite Ashwin running riot is a positive sign in Kohli in the captain. They did not fare any better in the second innings, crumbling to 196 all out in 50.5 overs in the final session.