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
Burel 5-4 Boulter*
A shaky service game for Boulter presents Burel with another break point, but the unfazed Briton steadies the ship to make it four games apiece.
With Burel 30-15 up on serve in the next, Boulter misjudges a forehand before Burel gets one of her own on target.
Big game coming up now.
Williams 5-4 Tan*
Serena is doing her best to "come on!" and scream her way into the ascendancy, urging herself to wake up as she leaves a Tan forehand that was perilously close to dropping in.
Her mum, Oracene, looks completely unruffled by what's unfolding in front of her. She's an absolute icon.
Excellent court coverage from both players and it's Serena who comes out on top to hold to love.
She's a game away from taking the opening set in her first singles match for a year.
*Williams 4-4 Tan
What Harmony Tan needs here is a quick hold and put the pressure right back onto Serena Williams...
A thudding return of serve from Williams reminds Tan what her opponent can do, but Tan produces an absolutely outstanding backhand down the line off a Williams smash to hold!
Williams applauds the shot, as does the entire of Centre Court. Brilliant.
Williams 4-3 Tan*
Wimbledon looks an absolute picture in the evening sun.
Broady 4-6 6-3 7-5 6-7 (2-7) Klein
Britain's Liam Broady has been taken into a fifth set by world number 243 Lukas Klein, who has just triumphed 7-2 in the fourth-set tie-break.
Twelfth seed Diego Schwartzman awaits the winner of the fifth-set shootout.
Williams 4-3 Tan*
Excellent slicing from Harmony Tan, with a backhand from the back of court completely wrongfooting Serena Williams.
Back on serve we go!
Burel 4-3 Boulter*
Burel sends a baseline forehand long and suddenly Burel has another break opportunity!
Second serve, Boulter comes to the net but Burel sends a passing shot down the line. Classy.
Two good serves and Burel stops the rot to edge ahead once again.
*Williams 4-2 Tan
That's, er, not quite so good out of the air from Serena Williams, who serves, volleys, and nets. Oops.
Break point to Tan.
*Williams 4-2 Tan
Martina Navratilova
Nine-time Wimbledon singles champion on BBC TV
The biggest change is Harmony is running side to side, and Serena is running front and back, and that takes a lot out of you.
*Ritschard 6-7 (1-7) 3-6 4-5 Tsitsipas
Over on Court One, fourth seed Stefanos Tsitsipas is potentially a game away from the second round.
The Greek leads Alexander Ritschard by two sets and is 5-4 up on serve in the third.
Ritschard must hold next to stay in it.
*Williams 4-2 Tan
Gosh, she's moving well.
Another great volley from Serena Williams to save another break point.
*Williams 4-2 Tan
Now it's Harmony Tan's turn to cry out in celebration as she sticks in a rally, sending Serena Williams from side to side, and the American nets to give her a third break point.
*Williams 4-2 Tan
Great volley from Williams, tangled at the net, and it's deuce again.
Image source, Gett*Williams 4-2 Tan
What a lob that is from Harmony Tan!
Serena Williams gives up the chase, thinking it's going long, then smiles as it plonks on the baseline.
Another break point for Tan.
*Williams 4-2 Tan
Big, big serve down the T for Williams.
Deuce.
*Williams 4-2 Tan
Serena Williams dances around a forehand and spears it just wide.
It's a break back point for Harmony Tan...
*Burel 3-3 Boulter
And we're all tied up! A comfortable hold of serve sees Boulter take her third game in a row.
Now it's Burel who looks a little rattled out on Court 18.
Evans 1-6 4-6 2-3 Kubler*
Harry Poole
BBC Sport at Wimbledon
"Just break him! That's it! Just break him!"
Dan Evans knows what he needs to do. But it's proving far easier said than done.
The British number two goes a break down in the third and now needs to produce one of his all-time great comebacks to reach the second round.
*Williams 4-2 Tan
A casual 118mph ace from Serena Williams helps her on her way to a 40-15 lead, but a double fault and a cross-court swipe that goes just long means she finds herself at deuce.
Broady 4-6 6-3 7-5 6-6 Klein
Liam Broady's match with Lukas Klein on Court 17 has gone to a tie-break in the fourth set and if Broady takes it then he will be in the second round.