Osaka has just saved one set point, but there are still two more on the table. 6-4 Putintseva in the tie-break.

Tracy Austin
Two-time Grand Slam champion on BBC TV at Wimbledon

Putintseva has hit some lovely drop-shots just at the right times in this first set.

It's Putintseva who has come out on top on both occasions against Naomi Osaka, and Osaka is still yet to take a set against her opponent.

Naomi Osaka with the jumping two-handed backhand return and it's a metre out. Putintseva 5-3 up, two points from the first set.

A delightfully soft touch with the backhand drop shot from Putintseva brings it back to 3-3 in the first set tie-break.

Image source, Reuters

Osaka now leads 3-1 in the tie-break after getting some Hawk-Eye joy.

"Come on," is the Osaka scream as a backhand return is met by a two-handed backhand winner down the line from the world number two for an early mini-break in the tie-break. 0-1

Alex Haworth: I get the impression that Osaka just wants to get back to the US hard courts and forget about this grass stuff.

Seventeen winners from Osaka, but also 17 unforced errors. A mixed bag. But still, we go to a tie-break.

A huge stroke of luck for Putintseva as the ball bounces twice on the net for a winner for her and an attempt backhand slice from Osaka is then all over the place. Deuce.

Simon Reed
BBC Sport commentator at Wimbledon

It's a living hell for Osaka at the moment.

Image source, Getty Images

Putintseva is utilising the slice and eventually draws an error from the Osaka forehand. The Japanese player is furious with herself as more mistakes mean she can't get the break she needs and is now again serving to save the set.

Image source, Getty Images

Teenager Felix Auger-Aliassime has won his first Grand Slam match, beating Vasek Pospisil 5-7 6-2 6-4 6-3.

In an all-Canadian affair on Canada Day, the 18-year-old - seeded 19th after a remarkable rise up the rankings in the last year - dropped the first set.

But Auger-Aliassime gradually began to showcase the shot-making which has seen him earmarked as a major star of the future and took the match in four sets.

Tracy Austin
Two-time Grand Slam champion on BBC TV at Wimbledon

Naomi Osaka is still only 21 and she still hasn't reached her peak yet in my opinion.

This could well be going to a tie-break. The Osaka serve is so strong and she has now picked up five games, more than she did in the whole match against Putintseva in Birmingham two weeks ago. Five-five.

Image source, Reuters

Tracy Austin
Two-time Grand Slam champion on BBC TV at Wimbledon

As world number one you should walk out with that feeling of confidence.

The last seven to 10 years in the women's game the players seem to have felt like a target is on their back and they get overwhelmed with pressure.

We'll see how Ashleigh Barty handles that tomorrow.

There was no first-round drama for Novak Djokovic as he defeated Germany's Philipp Kohlschreiber 6-3 7-5 6-3. Here are the highlights if you weren't watching on BBC One earlier on.

Yulia Putintseva is one game away from a one-set lead after her latest hold. Meanwhile, the television cameras zoom in on someone loaded up with strawberries. Well, it is Wimbledon.

Greek seventh seed Stefanos Tsitsipas is a set apiece against Italian Thomas Fabbiano, while sixth seed Alexander Zverev, tipped as another potential candidate to upset the old guard in the men's game, leads Jiri Vesely 6-4 2-2.

Ivo Karlovic is still going strong at 40, leading Italian Andrea Arnaboldi 6-4 6-4, while Guido Pella is a set up against a man who will face Andy Murray in the doubles on Wednesday, Romania's Marius Copil.

In the women's draw, Czech 16th seed Marketa Vondrousova is currently trailing American Madison Brengle 6-4 3-1, while US player Danielle Collins leads Kazakhstan's Zarina Diyas 4-2 in the opening set.

Image source, EPA

Debbie: The Stefanos Tsitsipas - Thomas Fabbiano match is fascinating.

Tsitsipas and Fabbiano are currently locked at one set and one game apiece on court two.