Stan Wawrinka, having staved off two break points in his previous service game, is now looking hungry for a break of his own.

He challenges a call at 15-30, but Hawk Eye shows it's wide - to Grigor Dimitrov's relef.

Wawrinka pops an attempted lob long and Dimitrov follows up with a thumping first serve to hold.

The sixth seed wraps one into the net, and shrugs in disbelief. Keep those shoulders loose.

One more chance to break for Grigor Dimitrov. Stan Wawrinka pushes him right, gives the Bulgarian the eyes and then whips it down the same straight to save.

Cracking forehand to follow up from Wawrinka, and he holds with a punchy serve.

Uh oh, Stan's wavering.

He gives up two break points. Grigor Dimitrov senses an opportunity.

Both players have held serve at the start of the fourth set.

This is basically a slug fest between two players low on confidence. Wawrinka went out in the first round last year and is on his way back from a knee injury. Dimitrov has struggled for wins since Kyle Edmund dumped him out of the Australian Open in January.

Saj Chowdhury
BBC Sport at Wimbledon

First mini test for Norrie on his serve. He’s taken to deuce after losing his bearings from the back of the court.

Plenty of supporting shouts for the current Brit.

He holds. Fist pump.

Pressure back on his opponent.

Cameron Norrie saves the break point. And now it's the Brit with a chance to close out his service game.

The 22-year-old slings a left-hander across court, Bedene gets too much on his return and it drifts long.

A solid hold after going a break point down.

Charlene: Well woah....check Wawrinka out. What a backhand winner that was to take the set.

Zac: Stan Warwinka would go down as an all-time great if he’d been born in literally any other era. Guy oozes class and talent.

Lovely stuff from Cameron Norrie.

He whips a cross-court forehand winner to make it 40-15, but then can't wrap a racquet around a baseline stroke enough to pull it inside the line with Bedene at the net.

The Slovenian scrambles to deuce. It's looking a little blustery out on Court 14.

And now Aljaz Bedene has a break point.

John McEnroe
Three-time Wimbledon singles champion on BBC TV

This is another task for Dimitrov. You're out there on your own. He's going to have to dig deep to get the win now. So many chances to win that third set.

Cameron Norrie holds serve, over to you Aljaz Bedene...

Does the Brit sense a break? He edges his way to 15-30 to lead on Bedene's serve for the first time in this match.

But the Slovenian responds promptly to scramble back to 40-30 and then wrong-foots the 22-year-old with a smart forehand.

Here comes Stan!

Wawrinka, having been hammered by Grigor Dimitrov in the first set, has turned this one around and now leads 2-1 against the sixth seed after taking successive tie-breaks.

Saj Chowdhury
BBC Sport at Wimbledon

What is noticeable is that Bedene has a lot more weight on his serve. However, Norrie seems to have the upper hand from the baseline.

This could be a long one folks.

There are some folk around me chattering about when Bedene stopped being British.

Mickey: What a treat to open up Wimbledon for the fortnight with what would in past times normally be a 4th round 1/4 final match!!! Come on Stan!

Eoghan: Wawrinka v Dimitrov / Monfils v Gasquet. Both on at the same time in the first round of Wimbledon. Madness. Tennis in 2018 folks.

Aljaz Bedene is serving well. A fourth ace kicks up some chalk to make it 40-30 and the Slovenian holds as Cameron Norrie rattles a return into the guts of the net.

This one remains on serve.

Serena Williams on her 7-5 6-2 win over Arantxa Rus: "It's good. I don't know if I'm relieved, more motivated, but happy to get through that.

"She played unbelievable today, I've never seen that from her, but that is the game, you've got to be ready for anything. I didn't play my best but I'll get there, one match at a time.

"It's a great feeling to be back, it's been a couple of years since I played on grass, so it is different trying to find that rhythm."

Stan Wawrinka saves two set points against Grigor Dimitrov on Centre Court.

This one's going to a second successive tie-break...

You can watch it here.

Over on court 12, eighth seed Kevin Anderson is making light work of Slovakian Norbert Gombos.