Harmony Tan beats Serena Williams 7-5 1-6 7-6 (10-7) in tie-break decider
Rafael Nadal defeats Francisco Cerundolo 6-4 6-3 3-6 6-4
Britain's Liam Broady wins 4-6 6-3 7-5 6-7 (2-7) 6-3 against Lukas Klein
Alastair Gray, Jack Draper and Ryan Peniston through; Dan Evans out and Paul Jubb loses in five sets to Nick Kyrgios
GB's Katie Boulter beats Clara Burel 7-5 6-3; Heather Watson also into round two; Swan, Clarke & Kartal out
Women's number one seed Iga Swiatek beats Jana Fett 6-0 6-3
Williams 5-7 6-1 4-4 Tan*
Superb. Right on the money from Tan, finding the line with a wicked backhand winner. She looks for the same spot, but this one drifts wide. And now Serena Williams senses a chance at 15-30.
Williams 5-7 6-1 4-4 Tan*
A scream of relief from Serena Williams as Harmony Tan bats a return long. Tan looks dialled in now, but sends another backhand long and that's 40-30.
Another big serve and Tan's backhand goes the same way. A big, big hold for Williams.
*Williams 5-7 6-1 3-4 Tan
Harmony Tan is finding some great depths on her groundstrokes now, making Serena Williams play behind the baseline and the American cannot get that one back. And then Williams hooks a straightforward backhand into the tape. The noise ramps up on Centre Court.
*Williams 5-7 6-1 3-4 Tan
Johanna Konta
Former British number one on BBC TV at Wimbledon
This is what you want to see. You want to see players raising their level and as a spectator and fan, you want to see an entertaining match.
*Williams 5-7 6-1 3-4 Tan
Brilliant exchange. Harmony Tan has Serena Williams on the run and keeps her composure to take the point and hold serve. Three games in a row for the main-draw debutant!
Martincova 2-4 Pliskova
There's still tennis being played out there!
Williams 5-7 6-1 3-3 Tan*
Harmony Tan just gave Serena Williams a look and the American engineers some serious pace on a flicked return towards the Frenchwoman's feet. Tan is not fazed. She gets Williams on the run off the next point, the 23-time Grand Slam champ picks it up, but Tan prods into the open court. 40-30.
Williams 5-7 6-1 3-3 Tan*
Chris Bradnam
BBC Sport commentator at Wimbledon
Got it... and applauded by Serena Williams. That's how good that was.
Williams 5-7 6-1 3-3 Tan*
Woah! What a shot from Harmony Tan. That is sublime. She's running towards the corner and digs out a superb passing winner from deep. And breaks back!
*Williams 5-7 6-1 3-2 Tan
Serena Williams sprints in to meet Harmony Tan's return with a low volley and saves the first.
*Williams 5-7 6-1 3-2 Tan
Awkward from Williams and her forehand leaps long. Big chance now for Harmony Tan. Three break points.
*Williams 5-7 6-1 3-2 Tan
Serena Williams hooks a backhand wide and now Harmony Tan has a big opportunity at 0-30...
*Williams 5-7 6-1 3-2 Tan
Johanna Konta
Former British number one on BBC TV at Wimbledon
I think it has been really impressive how Tan has gone about her business, and she's staying in touch, she's really competing.
That was such an important game for Harmony to win there because Serena is such a good front-runner.
Williams 5-7 6-1 3-1 Tan*
Chris Bradnam
BBC Sport commentator at Wimbledon
She's really turning it on now, Serena. The warmth in the applause watching this phenomenal champion, playing at this exceptional level.
Williams 5-7 6-1 3-1 Tan*
Oh, superb. Serena Williams bides her time and then scuttles on to a short ball, sweeping it away on a narrow angle with a delightful backhand winner. A little shake of the fist as she adds another point, and then the pick of the bunch with a passing backhand winner from down low on the baseline at full stretch!
Williams backs up that earlier break.
*Williams 5-7 6-1 2-1 Tan
Nice from Tan, leaping into a backhand and it's too hot for Williams to pick up. Anything you can do... Serena responds with a backhand winner of her own that zips off the Centre Court turf. 15-15.
*Williams 5-7 6-1 2-1 Tan
And this one she takes!
Harmony Tan goes deep with a backhand and the call is long. Serena Williams breaks.
Williams 5-7 6-1 1-1 Tan*
Well taken. The American watches the ball drop out of the sky beneath the roof and slaps it away to bring up a second break point in this game.
Williams 5-7 6-1 1-1 Tan*
Good line and depth from Tan and she forces Williams long to fend off that break point. Deuce.
Williams 5-7 6-1 1-1 Tan*
Just as I say that, the tempo drops and Harmony Tan fights her way back to 30-30. But then a double fault from the Frenchwoman, and that could be very costly! Break point Serena Williams.