The rally of the match so far sees Novak Djokovic produce a brilliant diving forehand. The Serb is quickly on his feet only to be sold a dummy by Marin Cilic with a deft volley.

An attritional game on the Djokovic serve as both players are unable to close it out despite having chances.

Back to deuce.

Some brilliant returns from Marin Cilic to the Novak Djokovic serve - including a fantastic passing shot - and he has three break points at love 40.

However, three gutsy serves from the Serb and he saves them.

Deuce.

Much better from Marin Cilic as he follows up with his own service game to love. The Croat produces a monster ace to clinch the game. That will give him a boost.

Image source, Reuters

Charlene Beedie: The defence work from Novak Djokovic is insane. Game won as well. Get in there. Novak to win today.

Image source, instagram.com/kyle.edmund

British number one Kyle Edmund is happy to see Andy Murray back in action again, and posted a picture of the pair on his Instagram account.

By contrast, Novak Djokovic's serve is clean as a whistle. He efficiently serves out a game to love.

Confident stuff.

Marin Cilic's first serve has not quite clicked into gear and Novak Djokovic capitalises to take the first two points. At love 30, though, the Croatian battles back and closes out the game with an ace. That's more like it.

Only 16% percent of Cilic's first serves have been in thus far.

Image source, Getty Images

Britain's Andy Murray has been out practising in Eastbourne today and will continue to test his fitness ahead of Wimbledon tomorrow when he faces Stan Wawrinka in the Nature Valley International.

We've also had confirmation that Murray's match against the Swiss three-time Grand Slam champion will not be played before 16:00 BST.

Murray, who has been out of competitive tennis for almost a year with a hip injury, made his return on Tuesday at Queen's, where he lost in three sets to Nick Kyrgios.

Novak Djokovic does not give Marin Cilic a sniff, though, and holds his nerve and his serve.

An opportunity for an early break point at 30-40 for Marin Cilic as he returns well to the Novak Djokovic serve.

A pulsating rally follows on the Serbian's second serve, and he shows brilliant defence to hang in the point until a Cilic return strikes the net.

Deuce.

Image source, Getty Images

A bit of a breeze blowing around Centre Court at Queen's. The big-serving Marin Cilic shows signs of a few nerves in his first service game.

At 40-15 he has Novak Djokovic scampering around the court but completely fluffs at return. However he goes on to close out the game. That should settle him down a bit.

Peter Fleming
Seven-time Grand Slam doubles champion on BBC Two

Today might be the day for Novak when he flicks the switch and gets back to winning again. It might take a few more months but he's a great champion and he's definitely back on track.

Image source, AFP

Former Ukraine striker Andriy Shevchenko is court side at Queen's - perhaps he still has house in nearby South Kensington from his days at Chelsea? - and is there to support his mate Novak Djokovic.

The Serbian's start is a little scrappy but at 30-30 all he holds his serve to win the first game.

The umpire has called 'play' and Novak Djokovic, sporting a white cap, will serve first.

Image source, Getty Images

Despite the rivalry between Serbia and Croatia, Novak Djokovic revealed he and Marin Cilic are on good terms off the court and often train together.

“There are not many secrets, so to say, between ourselves," Djokovic said.

"We are good friends and we practice a lot. We know each other's game quite well. "I have known him very well on and off the court. A lot of respect for each other."

Peter Fleming
Seven-time Grand Slam doubles champion on BBC Two

Novak is not the biggest hitter and doesn't have the biggest serve but he places it well and that sets him up for his powerful groundstrokes.

His return of serve is one of his best weapons but Cilic has such a big serve and his placement is so good - and you can't hit what you can't see.

Image source, Getty Images

Marin Cilic reached the final of Queen's last year where he lost to Spaniard Feliciano Lopez on a tie-break in the third set and hopes to go one better this time.

“I don’t have regrets for last year," Cilic said.“I gave it my best on the court. My match was decided by one point. Feliciano Lopez played amazing tennis.

"You know, it’s great for me again that I’m here and giving myself another shot.”

John Lloyd
Former GB Davis Cup captain on BBC Two

This will be a big gauge about how far Novak Djokovic has come. He's played so well here but got very testy yesterday, probably thinking he still wasn't hitting the ball the way he likes to play, and he will have to play very well today because Marin Cilic is playing lights out tennis.

Novak Djokovic has won the toss at Queen's and has decided to serve first.

Image source, Getty Images

Novak Djokovic might boast a formidable record against Marin Cilic but acknowledged that his opponent's performances have been particularly impressive since their last meeting in 2016.

Djokovic said: “In last couple of years he's been in the form of his life and reaching his highest ranking in a career. And finals of Wimbledon, finals of Australian Open.

"You know, he's probably been playing the best that he's ever played. Grass court suits him very well. Big serve. Just big game overall.”