Donna Vekic revealed she was in "so much pain" in her record-breaking Wimbledon semi-final defeat to Jasmine Paolini, explaining her tears in the third set of a marathon match.

Vekic let slip a first-set lead to lose 2-6 6-4 7-6 (10-8) on Centre Court and miss out on a major final debut.

It appeared emotions had got the better of the first-time semi-finalist as victory slipped away despite a further early break in the decider, eventually losing after two hours and 51 minutes.

This was the longest women's singles semi in Wimbledon history, and Vekic insisted her tears were provoked by the punishment her body took in the epic encounter.

"I thought I was going to die in the third set," Vekic said in her post-match news conference. "I had so much pain in my arm, in my leg.

"It was not easy out there, but I will recover.

"I was more crying because I had so much pain, I didn't know how I could keep playing. My team tells me I can be proud of myself.

"It's tough right now. It's really tough to be positive right now. It was so close." 

Paolini will now play Barbora Krejcikova in Saturday's final, her second grand slam title match after losing to perennial French Open champion Iga Swiatek at Roland Garros in June.

"Two grand slam finals in a row was crazy to believe, I think, no?" Paolini said. "I'm also surprised how at the moment, until now in this moment, I'm living this.

"I feel maybe Saturday I will be so nervous, I don't know, but I feel also relaxed. I'm the same person. I'm doing the same things. I'm surprised a little bit how I'm managing this.

"I don't want to say more, because maybe Saturday I'm going to be shaking. I'm surprising myself to live this with with really relaxing mood."