Good morning, and welcome to our LIVE coverage of the women's semi-final between Kiki Bertens and Serena Williams.

Williams 7-6 6-4 Bertens: A big shout from Williams as she moves to the net, leaving Bertens stranded and swishing at air. She finally takes match point with a final crashing forehand, and both exhausted players shake hands at the net. Serena looks so tired she can barely wave at the crowd.

Williams 7-6 5-4 Bertens: Three match points saved for Kiki Bertens, who benefits from wide Williams returns - and Serena is going to have to serve this out.

That Serena serve is still blistering, and though Bertens tries so hard she can't muster anything.

Williams 7-6 5-3 Bertens: Serena Williams wipes her face with her sleeve as she grits her teeth for one last effort.

Williams 7-6 4-3 Bertens: The sheer pluck of Serena Williams is something to behold. She breaks Kiki Bertens to take her fourth game in a row.

Williams 7-6 3-3 Bertens: Serena swipes in frustration at the ground. Bertens chases fruitlessly towards the back of the court, and she's suffering - another break point missed as well.

Williams 7-6 2-3 Bertens: Bertens keeps her nose in front for this second set by holding serve again.

Williams 7-6 2-2 Bertens: Williams is breathing heavily as she holds her serve. The physical toll on both these players is clearly very large.

Williams 7-6 1-2 Bertens: After Bertens fired out of the second-set blocks, Williams breaks right back.

Williams 7-6 0-2 Bertens: Well, she gets one - and she takes it! A break to love for a beaming Kiki Bertens.

Williams 7-6 0-1 Bertens: Bertens is going to have to dig deep now. She missed six of the seven break points she had on offer in the first set - will she get similar opportunities in the second?

Williams 7-6 Bertens: Williams is trying to get Bertens to move, and having some success with making her very uncomfortable. Bertens is attempting the same tactic with similar results. It's painful viewing. Both women miss set points, with Serena failing on the volley and Bertens struggling on the forehand - but Williams takes it 9-7.

Williams 6-6 Bertens: So, into a tie-break. This is bound to do this injured pair a world of good.

Williams 6-5 Bertens: Williams is in front for the first time in this match and although she looks frustrated with herself and her physical limitations today, she's getting her game face on.

Williams 5-5 Bertens: Kiki Bertens, in her tights and blue skirt, slips as she tries to meet the Williams return, and rather than serving it out, she loses her advantage.

Williams 4-5 Bertens: Williams wins a point then pulls up - she's clearly in pain. She's trying to make use of the drop shot as best she can.