A lovely, delicate drop shot from Kyrgios wipes out the first set point, one down, one to go.

Humbert produces one of his best returns of the match so far, that pulls Kyrgios our of position and the Frenchman slaps away the resulting forehand.

A Kyrgios lob shortly after is long and it's two set points for Humbert. 15-40

A blasted forehand down the line from Kyrgios, but it narrowly misses and a two-handed backhand return is just out and Humbert survives that scare.

This could be a big phase of this match, we're at 30-30, if Kyrgios can steal the next two points he's serving for a two-set lead.

In the women's draw, American great Serena Williams was left in tears as her latest attempt for an elusive record-equalling 24th Grand Slam title was ended by injury against Aliaksandra Sasnovich.

World number one Ashleigh Barty held off a spirited Carla Suarez Navarro to win 6-1 6-7 (1-7) 6-1, and five-time champion Venus Williams earlier beat Romanian Mihaela Buzarnescu 7-5 4-6 6-3 on her 90th Grand Slam appearance.

She will play Tunisia's 21st seed Ons Jabeur next, after she swept past Sweden's Rebecca Peterson 6-2 6-1 in 62 minutes.

Meanwhile, former world number one Karolina Pliskova overcame a first-set scare to beat Slovenia's Tamara Zidansek 7-5 6-4 will face Donna Vekic in the second round.

A rare lengthy rally in the eighth game of this set and it goes Kyrgios' way as Humbert is unable to lift one from his shoelaces from the back of the court.

Kyrgios then tries one through the legs, but it was never on and his shot rolls tamely into the net. It doesn't matter as he bolts down an unstoppable serve shortly after.

Play is over on the outside courts for the day with Russia's Elena Vesnina having just finished off Italian Martina Trevisan 7-5 6-1 on court 11.

Among the matches forced to stop for bad light was Gael Monfils v Christopher O'Connell with the French 13th seed 3-2 up in the final set.

Marin Cilic won a tie-break to take the first set against Salvatore Caruso when they decided to stop and finish off tomorrow.

As you may have seen if you were with us a little earlier, Britain's Cameron Norrie lost a first-set tie-break to Lucas Pouille on court two immediately before they called a halt.

Only 55 minutes of action so far and we're halfway through the second set after 10 games in the first and seven in the second. Blink and you miss something.

Could be one of those sets when one bad game costs you. They're swapping service holds at lightning pace and we're at 3-3.

In the men's draw, British number one Dan Evans reached the second round with a straight-set 7-6 (7-4) 6-2 7-5 win over Feliciano Lopez.

Roger Federer avoided a huge upset as France's Adrian Mannarino withdrew through injury when leading the eight-time champion 6-4 6-7 (3-7) 3-6 4-2 on Centre Court.

Meanwhile, world number two Daniil Medvedev prevailed in four sets against Germany's Jan-Lennard Struff, winning 6-4 6-1 4-6 7-6 (7-3), and fourth seed Alexander Zverev claimed a comfortable 6-3 6-4 6-1 win against the Netherlands' Tallon Griekspoor.

Among the other top seeds, Argentine ninth seed Diego Schwartzman defeated France's Benoit Paire 6-3 6-4 6-0 and Canadian 10th seed Denis Shapovalov overcame German Philipp Kohlschreiber in five sets.

It's a tight and tense second set, still on serve. This is our main action with Centre Court stopping early due to withdrawals because of injury for Adrian Mannarino and Serena Williams earlier on.

Second seed Daniil Medvedev was a winner earlier today in four sets against Jan-Lennard Struff and this is what's he's tweeted...

They're not messing about in the second set with three rapid holds, two from Humbert and one from Kyrgios.

Kyrgios is down in 60th in the world rankings, largely due to his inactivity recently but is surely one of the toughest draws any of the seeds could've picked up.

Brilliant when he's in the mood, unmissable at all times.

A hold to love and Nick Kyrgios, who said this fortnight was a case of 'strawberries and chill', gets off the mark in the second set.

Ugo Humbert, 25th in the world and seeded 21, takes the opening game of set two against Kyrgios.

The Australian is playing outside his country for the first tournament since January 2020, but he's the one who is a set up.

A mixture of brute force and a deft drop shot to finish it and that's the first set for Australia's Nick Kyrgios.

Today at Wimbledon has just started on BBC Two with Pat Cash and Marion Bartoli in the studio alongside Clare Balding.

We will turn our focus to Nick Kyrgios v Ugo Humbert, while also keeping you abreast on what's happening on the other matches that are still on court.

We're still going on Court One with the roof closed and Nick Kyrgios is serving for the first set against France's Ugo Humbert.

Kyrgios was 3-1 down earlier on.

That double fault from Cameron Norrie is going to be the last action we see today on Court Two as play is suspended as the light is not good enough to keep going.

Norrie may well be replaying that tie-break over and over in his mind for the rest of the night. Back again tomorrow to finish this one.