Image source, PA Media

After defeat in the finals of the first two Grand Slams of the year, world number one Aryna Sabalenka will be determined to go one better at the All England Club.

The 27-year-old missed last year's tournament because of a shoulder injury but reached the semi-finals in 2021 and 2023 - and kicks off the action on Court One today.

Having won 42 of 50 matches so far in 2025, Sabalenka's form could hardly be better as she attempts to add to her three major titles.

Aiming to stop her this afternoon is Canadian qualifier Carson Branstine. It is the 24-year-old's first appearance in the main draw of a Slam and, up against the world's top-ranked player, it's straight in at the deep end for her.

Gary Rose
BBC Sport at Wimbledon

We're on serve here in the third set as GB's Oliver Tarvet looks to secure a dream place in the second round on his Wimbledon debut.

The 21-year, who is ranked 719th in the world and came through qualifying to secure his place in the main draw, is playing some confident tennis at the moment and a superb cross-court winner to hold just now drew the biggest cheer of the match so far.

Image source, Getty Images

Jelena Ostapenko gets the break at the second attempt.

Sonay Kartal came from 5-2 down to win the first set. This would be the comeback of all comebacks if Ostapenko turned this around!

Cheers on court 18 as Cameron Norrie breaks for a 4-2 lead in the first set.

After holding firm at 30-30 on his own serve in the previous game, the Briton races into a 40-15 lead on the Roberto Bautista Agut serve.

He can't take the first break point but makes no mistake with the second. He'll serve for a 5-2 lead.

Jelena Ostapenko has decided to finally turn up in this third set.

The Latvian has three break points.

Image source, get

Jo Durie
Former British number one on BBC Two

That was such a solid game from Sonay Kartal.

She is making a lot of plays and moving so well around the court.

Ostapenko isn't interested in any rally over two or three shots at the moment, but Kartal is keeping herself in the rallies for that amount of time.

Jonathan Jurejko
BBC Sport senior tennis reporter at Wimbledon

Could this be another Medvedev marathon?

The two-time semi-finalist loves a Wimbledon epic, with 14 of his 27 matches going four or five sets (seven each).

But history - an logic - suggests he will prefer to get things done in four sets, having won six of those seven and only three when it has gone the full distance.

Now he is a break down in the third set and getting tetchy.

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Sonay Kartal is unstoppable.

The British number three earns a third break and will serve for the match.

The crowd, like Sonay Kartal, have grown into this match.

Kartal gives them further reason to cheer as she earns another two break points.

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Sonay Kartal has one foot in the second round.

The Briton recovers from a slip to get the hold.

Frustration continues to build for Jelena Ostapenko.

Cameron Norrie is under way in his first round match against experienced Spaniard Roberto Bautista Agut on court 18.

It's still on serve at 2-2 in the first set with Norrie having lost just two points on serve to this point.

Sonay Kartal gets it at the first time of asking as Jelena Ostapenko double faults.

The British number three is firmly in control now.

Sonay Kartal is flying.

The Briton has three opportunities to secure a double break in this third and final set.

Harry Poole
BBC Sport

It feels only a matter of time before Wimbledon enforces its heat rule.

A reminder, that will happen once temperatures exceed 30.1C.

The previous record temperature for the start of the Championships was 29.3C, set in 2001.

The Met Office confirmed just before midday that temperatures had risen to 29.7C at Kew Gardens, and they say this is provisionally the warmest start to Wimbledon on record.

The hottest temperature ever recorded during the tournament remains the 35.7C reached in 2015.

It remains to be seen whether it gets quite that warm, with temperatures in the UK only ever exceeding 34C in the month of June in three years since 1960 (1976, 2017, 2019).

Jo Durie
Former British number one on BBC Two

If you look at Sonay Kartal, she looks kind of cool and calm.

If you look down at the other end, Jelena Ostapenko looks a bit hot and bothered.

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Sonay Kartal was made to work for it but she gets the hold to consolidate that early break.

Kartal hasn't been in this position - a two-game lead - in the match before.

Oliver Crawford responds in brilliant fashion with a hold to love on his own service game.

Mattia Bellucci makes it three games in a row that finish with a hold to love as he fires an ace down the line to take the second set.

The crowd on court 16 have been entertained thanks to a brilliant contest so far.

Jo Durie
Former British number one on BBC Two

Take your luck when it's there! This has been such an interesting game.

Jelena Ostapenko definitely got her first serve percentage up in that second set - she was serving much better and she wasn't having to catch her ball toss so much - but she has just started this third set a little bit jerky.

Sonay Kartal can take advantage of this.

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Sonay Kartal saves and gets it back to deuce.

Further frustration from Jelena Ostapenko as she swings her racquet into thin air.

In the opening set that frustration allowed Sonay Kartal to take control but in the second it only served to spur Ostapenko on. Which way will it go in the third?

It seems it is in the Latvian's favour...