Tracy Austin
Former Wimbledon mixed doubles champion on BBC TV

It is really incredible at 36 that Venus is in the quarter-finals for the first time since 2010. 

She is always a dangerous threat.

Venus has won this five times and her passion is just as strong as ever and is playing very well.

It was all about the code violations and sit-down protests in the doubles match between Pablo Cuevas and Marcel Granollers, and Britain's Jonny Marray and Adil Shamasdin.

Cuevas was handed a code violation for unsportsmanlike behaviour when he threatened to urinate into a ball can after being told he could not leave the court to visit the bathroom in the fifth set.

He then angrily smashed a ball out of the court following a double fault and the 15th seeds were docked a point, resulting in Cuevas and his partner sitting down and refusing to play the final game.

The tetchy pair ended up losing their third-round match 6-3 4-6 6-4 3-6 14-12.

Image source, Getty Images

Britain's Jamie Murray and Brazilian partner Bruno Soares will have to finish their match doubles match today after it was halted for darkness.

The pair are tied at 6-3 7-6 (7-3) 4-6 4-6 13-13 with Mate Pavic of Croatia and New Zealand's Michael Venus. 

Murray and Soares, the third seeds and Australian Open champions, won the first two sets and also had a break in the fifth but were unable to maintain their advantage. 

They've been going for an epic four hours and 51 minutes, and will restart again after 13:00 BST on court 17.

Image source, Rex Features

Matthew Plampton: Would love to see @Venuseswilliams lift Wimbledon trophy again. I still use that 2005 final fightback as sporting motivation.

Chris Brown: If Cibulkova isn't too tired, she'd be my pick. An Aus Open final rematch could on the cards though!

Let us know your picks for the women's title this year...

Frank Keogh
BBC Sport

The stage is set for women's quarter-finals day on Centre Court and Court One at Wimbledon.

After a topsy-turvy time on the weather front during the 2016 tournament, both arenas are bathed in sunshine on the second Tuesday.

Image source, BBC Sport

Andy Murray is one of five players named by Great Britain for this month's Davis Cup tie with Serbia, although the world number two will not confirm his involvement until after Wimbledon.

The Scot's brother Jamie, Kyle Edmund, Dan Evans and Dom Inglot are in the team for the round two tie in Belgrade.

Serbian world number one Novak Djokovic has already said he won't be involved in the tie.

The 29-year-old admitted he was not 100% fit after he was knocked out of Wimbledon in the third round by Sam Querrey.

Image source, Rex Features

Britain's Andy Murray stormed his way into the last eight of Wimbledon 2016 with a pitch-perfect victory over Australian Nick Kyrgios.

Scotsman Murray has yet to drop a set at this year's tournament. Could he be on his way to a second Wimbledon title?

Next up for the world number two on Friday is two-time semi-finalist Jo-Wilfried Tsonga from France. 

• There are six nationalities represented in the quarter-finals this year: Germany, Kazakhstan, Romania. Russia, Slovakia and the USA.
• Serena Williams is the only player who also reached the last eight last year.
• Three remaining players have won Grand Slam titles - Serena and Venus Williams and Angelique Kerber.
• Simona Halep and Dominika Cibulkova have both reached Grand Slam finals before but have never lifted a trophy.
• Elena Vesnina and Yaroslava Shvedova are the two unseeded players remaining. 

Image source, Rex Features

Mike Henson
BBC Sport at Wimbledon

Image source, BBC Sport

The ball guy is back.

Last year, the inflatable promotional sphere has taken up a more prominent, but riskier perch further down the hill, alongside some privet hedges, towards Wimbledon station.

This year, he has returned to base, outside a sports equipment shop and is looking all the happier for it.

Who do you think will lift the women's singles title?

Rebecca Hindle: Serena v Venus final.

Bel: Don't think Serena will retain her title this year.

Lancelot: With the way Serena is playing, yes it is hers to lose.

There's a star-studded order of play around the outside courts at Wimbledon today.

Among the stars out on the grass for the senior and invitational matches are Jonas Bjorkman, Martina Navratilova, Goran Ivanisevic, Greg Rusedski and Henri Leconte.

A guest list bigger than big John Isner's big serve.

The order of play can be found here.

Talking of Serena and Martina....

Over on BBC iPlayer, you can catch up on two documentaries about these two extraordinary women.

'Serena' can be found on this link.

'Just call me Martina' is over here.

Right then. 

Predictions please for the women's singles title.

Will it be Serena Williams' year again? Or can sister Venus add a sixth trophy?

How about Australian Open champion Angelique Kerber? Or are you rooting for one of the underdogs this year?

Let us know via Twitter on #BBCTennis, external. You can also cast your vote by clicking on the 'vote' tab at the top of this page. 

Tomas Berdych had a face of thunder in the late stages of his match yesterday.

There's speculation in the Czech press as to what rattled the 10th seed the most during his unfinished 'derby' against compatriot Jiri Vesely. 

Newspaper Blesk, external says it was a combination of "darkness, five match points and Mexican waves" that made the veteran's head "almost explode". 

Crikey. 

Image source, rex

We didn't quite get through all the men's last 16 matches yesterday because these two Czechs seem to love a tie-break.

Jiri Vesely, the world number 64, fought back from two-sets-to-one down against 10th seed Tomas Berdych to win a mammoth fourth set tie-break 11-9 before bad light ended play.

The pair will resume after 13:00 BST for a chance to face Lucas Pouille in the quarter-finals.

Image source, Rex Features

It was a bit gloomy over SW19 this morning, but looks like we could be in for a dry day according to BBC weather man Simon King.