They are worlds apart in terms of titles and profile but 23-time Grand Slam champion Serena Williams and qualifier Evgeniya Rodina, who meet in the Wimbledon fourth round on Monday, have one big thing in common.

Both are mothers – Williams’ daughter Olympia is just 10 months old, Rodina’s little girl Anna is five and a half years old.

And the number of women who have returned to the professional game after taking time out to have children is still small enough that the presence of two mums at this stage of a Grand Slam remains a relative novelty.

Rodina, whose surname means ‘motherland’ in her native Russian, is enjoying her best ever Grand Slam performance, having never previously got beyond the second round.

Williams, meanwhile, is chasing an eighth Wimbledon singles title and with just one of the top 10 women’s seeds left in the draw she is becoming a lot of people’s favourite to lift the Venus Rosewater Dish.

The 36-year-old American’s return to tennis has been to great fanfare – she has been the subject of a documentary, her daughter already has her own Instagram account and Williams’ every match has been scrutinised for signs that she can return to her best form.

Rodina, 29, meanwhile, has a two-and-a-half-line personal biography on the WTA website, which says she likes swimming, listening to music and reading Dostoevsky.

Williams’ form looks ominous for rivals

It would be an incredible comeback for Williams to win the Wimbledon title just 10 months after giving birth, a difficult delivery during which, she has said, she “almost died”.

“It’s amazing for me to be out here. A year ago I was still pregnant,” said Williams, who won the 2017 Australian Open while around eight weeks pregnant. “Then my delivery took a turn south fast, so that wasn’t fun.

“But it’s that that makes me appreciate that I’m out here, that I’m alive, that I’m able to be here and do well and to play well.”

She returned to competitive singles in March and reached the last 16 at French Open but withdrew from her scheduled match against Maria Sharapova with a pectoral muscle injury that affected her serving.

She did not practise any serves from then until she arrived at the All England Club but she has still delivered the second fastest serve of the women’s tournament so far at 119mph, second only to her sister Venus’ 123mph.

It is not just her serves that have improved; her movement around the court is quicker than in her slightly laboured first-round victory over Arantxa Rus.

And in her third-round victory over Kristina Mladenovic she showed she still had the mental strength and desire to fight back when she won six games in a row from 5-3 down in the first set.

It all looks a little ominous for the rest of a women’s draw in which only Czech seventh seed Karolina Pliskova remains of the the top 10.

More mums on Tour

Williams is asked about her daughter and being a mum at every news conference, so rare is it for a woman at the very top of the game to take time out to have a baby.

Only three mothers have won Grand Slam titles in the Open era – Belgium’s Kim Clijsters and Australians Evonne Goolagong Cawley and Margaret Court.

Williams has backed Victoria Azarenka’s call for more childcare facilities at tournaments and hopes that Wimbledon’s decision to give her a seeding despite her world ranking of 181 will also help players if they want to start families younger.

“I think it will be nice to see ladies live their life and not start having families at my age,” she said.

“I think Wimbledon did such a good thing with the seeding. It will be really nice for these women to take a year off, and have the most amazing thing in the world, then come back to their job and not have to start from the bottom, scrape, scrape, scrape. Still give them an opportunity to be out there for bringing life into the world.”

Rodina had her daughter when she was 23, a year after she had reached a career-high ranking of 74. She then dropped outside the top 400 and has been working her way back up since – she has climbed back to 120 in the world.

Of the six mothers in the singles main draw at Wimbledon this year, Kateryna Bondarenko, Tatjana Maria, Vera Zvonareva and Azarenka are out. But with Williams facing Rodina, there will still be one there in the quarter-finals.

Roger Federer, Rafael Nadal and Serena Williams will all be in action on ‘Manic Monday’ at Wimbledon.

With all of the men’s and women’s last 16 singles ties taking place, it is one of the most exciting days in the tennis calendar.

Defending champion Federer faces French 22nd seed Adrian Mannarino while two-time champion Nadal plays Jiri Vesely.

Seven-time winner Williams, the favourite for the women’s title, plays Russian qualifier Evgeniya Rodina.

Three-time champion Novak Djokovic will play Karen Khachanov while Gael Monfils meets eighth seed Kevin Anderson.

Karolina Pliskova, the only remaining women’s top 10 seed, plays world number 20 Kiki Bertens.

• Why are so many seeds out of Wimbledon?
• Live scores, schedule and results

Federer expecting ‘strategic’ match

Federer made serene progress through the first three rounds, extending his run of consecutive sets won at Wimbledon to 29 as he bids for a record-extending ninth men’s title.

The Swiss swept aside big-hitting Jan-Lennard Struff in one hour and 34 minutes in round three but said he is pleased at the variety of opponents he has played so far.

“It’s good that I faced different types of opponents I think in this first week, and was able to find a way to get through,” Federer said.

“I think it’s always helpful. He is a hard hitter. In the next round it will be a lefty. It will be much more of a strategic match, I believe.”

Nadal, another player who is yet to drop a set, plays another left-hander in Czech Vesely, the world number 93.

Williams has ‘nothing to lose’

The women’s singles event has seen a record number of shocks this year with only seven of the 32 seeds making it to the second week.

The pre-tournament debate surrounded whether Williams, now the world number 181, should have been seeded for this year’s Championships as she continues her return following the birth of her daughter.

The American was seeded at 25 and is now favourite to win an eighth title but she insists she has “nothing to lose” going into the latter stages.

“I have absolutely nothing to prove. Everything is a bonus,” she said.

“Every time I step out there, I know what I’m capable of. I know every Grand Slam, I’ve won them, I’m capable of just going out there and enjoying it.”

Six days gone, seven to go – many seeds have fallen but the queen and king of Wimbledon remain standing.

Between them Roger Federer and Serena Williams have made it into the second week 31 times in total – and going by their form so far they both look a good bet to go all the way.

Add to the mix Federer’s old foes, Novak Djokovic and Rafael Nadal, and you still have a strong men’s competition.

However, only Karolina Pliskova remains among the top 10 players in the women’s tournament.

I think Serena has as good a shot as anyone to win this event – which is crazy to think

Elsewhere, there are no Britons in the second week for the first time since 2007, with the two main hopes Kyle Edmund and Johanna Konta dumped out at the third and second-round stage respectively.

BBC Sport takes a look at the state of play at Wimbledon 2018 so far.

• Why are so many seeds out?
• Top seed Halep defeated
• Paire entertains, but loses to Del Potro – best shots
• Monday’s order of play

Wimbledon’s middle Sunday is here – but what does it mean, when was the first one and who did presenter Des Lynam famously interview in 1997?

There is no play on Sunday this year as the sunshine has been beating down and so no matches have been delayed, with the action resuming on Monday.

Is your Wimbledon knowledge as pristine as freshly washed tennis whites? Find out by taking the quiz.