With confirmation that Serena Williams will not play for the remainder of 2017, there is a G.O.A.T.-shaped hole to be filled on the WTA Tour.
The 23-time grand-slam winner confirmed on Wednesday she is pregnant with her first child.
Williams is aiming for a return to competitive action in 2018, having apparently won the Australian Open while carrying her baby if a "20 week" timeline she suggested in a since-deleted Snapchat post is accurate.
The American is likely to spend an entire grand-slam cycle - if not longer - away from the court, so Omnisport's Matthew Scott looks at who is best-placed to fill her mighty shoes as top dog.
Lest we forget, the German is world number one as Williams begins her sabbatical.
@serenawilliams!! You will be such an amazing mother and I wish your family health and happiness for the best journey in the world— Angelique Kerber (@AngeliqueKerber) April 20, 2017
After a difficult start to 2017, Kerber has begun to regain her form and reached a first final of the year in Monterrey last time out.
Kerber fell at the first hurdle at the Madrid and Rome Masters in 2016, as well as the French Open - leaving a glut of rankings points up for grabs if she can get her game together on clay this year.
Don't @ me.
The only player Sharapova has ever suffered a continued struggle against is... Serena Williams.
Sharapova holds career head-to-head advantages over Kerber (4-3), Venus Williams (5-3), Karolina Pliskova (1-0) and Garbine Muguruza (3-0) - each of the non-Serena grand slam finalists since she was suspended from the game.
And with her return from a doping ban coming just as her great rival is stepping away from the limelight, it gives the 30-year-old another motivation ahead of her comeback in Stuttgart next week.
Arguably no player on the WTA Tour currently has as much upward momentum as the world number seven.
In the space of two years, Konta has gone from world number 151 to breaking the top 10, with her sights already set on the very top.
After securing the biggest win over her career against Caroline Wozniacki in the Miami Open final, Konta said: "I play smart tennis and calmer tennis, I think."
Konta's three WTA titles have come in the past nine months and she has only lost one final to date, proving her burgeoning big-game temperament.
With two titles to her name already in 2017 backing up last year's run to the US Open final, Pliskova has risen to a career-best ranking of third in the world, leaving her in pole position to challenge Kerber for top spot for the time being at least.
Like the German, Pliskova will have plenty of points to make up on during the clay season and only a second-round defeat in Dubai blots an otherwise solid copybook from 2017 so far.
Wins over fellow top-10 players in Brisbane, Qatar and Indian Wells suggest the Czech has the appetite for the big occasion.
The Belarussian has as far to go to reach the top as anybody in this selection, Sharapova aside, but Azarenka's progress will be fascinating, once she returns to action after giving birth to her first child.
Today I had my hardest fight and my very best victory! Our son was born healthy and happy! So thankful and blessed! Thank you pic.twitter.com/zsoFRivnvQ— victoria azarenka (@vika7) December 20, 2016
Victories in Indian Wells and Miami last year - which included wins over Kerber and Serena - hinted that the two-time major winner was back to her best.
Azarenka has won seven of her nine career meetings with Kerber and is one of few players in possession of power even remotely similar to Serena.
If the 27-year-old can hit the ground running, it will suggest that Serena can too, so any of the above will have to be quick if they are to make the most of the WTA Tour queen's absence.
22 de noviembre 2017
|Lakers rally past Bulls|
|That´s not how I´d want my players to act - Root bemused by Lyon|
|MLS Review: Sounders a step closer to final, Crew and Toronto in stalemate|
|Earl suffers ACL injury as NRL return is put on hold|
|Ben Yedder trolls Liverpool after dramatic Sevilla comeback|
|Maxwell called into Ashes squad as cover for Warner|
|´World class´ Insigne can´t be rested – Sarri|
|Smith: Australia considering replacement for Warner|
|I say one thing and you write something else - Angry Ronaldo brushes off media|
|Yankees All-Star Judge undergoes shoulder surgery|
|Griezmann needs support of Atletico and fans – Simeone|
|Monaco paid for mistakes in Champions League exit - Jardim|
|We had to rely on personal pride - Berizzo praises Sevilla´s stunning comeback|
|Championship Review: Coleman loses first Sunderland game, Fulham win nine-goal thriller|
|City fans get first sight of local star they crave in Phil Foden|
|Gunes wants more after historic Besiktas Champions League qualification|
|Allegri plays down Dybala-Messi comparisons|
|Extra rest helped Rose shine in Dortmund – Pochettino|
21 de noviembre 2017
|Zidane: We knew Ronaldo, Benzema goals would come|
|It feels like we lost - Klopp frustrated at Liverpool´s second-half collapse|
|It depends on Foden - Guardiola puts ball in teenager´s court|
|Siddle excited by Smith´s duel with Root|
|Postecoglou leaves Australia post|
|Ronaldo overtakes Messi in Champions League goalscoring race|
|Manchester City 1 Feyenoord 0: Sterling strikes late as top spot is clinched|
|Sevilla 3 Liverpool 3: Klopp´s side fail to survive Spanish inquisition|
|Borussia Dortmund 1 Tottenham 2: Son grabs winner as Spurs seal top spot|
|Napoli 3 Shakhtar Donetsk 0: Insigne stunner helps keep knockout hopes alive|
|APOEL 0 Real Madrid 6: Record-breaking Ronaldo and Benzema send holders through in style|
|Monaco 1 RB Leipzig 4: Werner brace dumps Ligue 1 champions out|
|Memorable Ashes Moments: Triple wicket-maiden for destructive Johnson|
|Ronaldo breaks record for Champions League goals in a calendar year|
|´World´s Fastest Gamer´ wins McLaren F1 simulator role|
|History against England in Brisbane, as Cook targets Gabba milestone - the Ashes in Opta facts|
|I wanted to cry with Buffon - Rakitic sympathy for Italy great|
|Defiant Smalling responds to ´surprise´ England omission|
|Hughes ruled out of Samoa clash as Watson, Joseph omitted|
|MLB great Joe Morgan urges voters not to elect steroid users to Baseball HOF|
|Neuer ´on schedule´ but Heynckes won´t rush Bayern star|
|Messi contract saga not swaying Barcelona boss Valverde|
|Spartak Moscow 1 Maribor 1: Stoppage-time equaliser gives Russians everything to do at Anfield|
|Besiktas 1 Porto 1: Talisca leveller sends hosts through|
|Grand slams to reduce seeds from 32 to 16 from 2019|
|Mkhitaryan questions leave Mourinho riled|
|Jones out of Basel, Brighton games but Mourinho hopeful on Bailly|
|The Scrum-back Kid? Philips answers Scarlets SOS|
|Moore to retire from all rugby following Murrayfield Test|
|The Ashes: Australia and England leap into chasm of unknowns|
|Conte unhappy with Chelsea´s fixture congestion|
|Pepe tells Ronaldo: Come to Besiktas!|
|Clement expects Abraham to shake off back injury for Bournemouth clash|
|Oddo replaces sacked Del Neri at Udinese|
|F1 Raceweek: Contract talks for Hamilton, Alonso at Le Mans and Kvyat´s snub|
|Bartomeu hints at January Barcelona signings|
|Davis Love III to have hip-replacement surgery|
|Massa eyes final flourish in Abu Dhabi|
|Bears TE Zach Miller out of hospital three weeks after serious injury|
|Emery defends ´responsible´ Neymar from lifestyle criticism|
|Wales lose Williams and Cuthbert for All Blacks clash|
|Australia enlist Bolt to sharpen up Ashes preparations|
|Wimbledon will not be the same without her – Duchess pays tribute to Novotna|
|Del Neri sacked by Udinese|
|Everton striker Niasse facing two-match ban after FA diving charge|
|Wyatt makes history as England salvage Women´s Ashes draw|
|Lampard excited by English clubs in Champions League|
|Kvitova ready for ´second career´ to start in 2018|
|Williams deny Kubica deal has been agreed|
|Thiago and Coman back for Bayern´s trip to Anderlecht|
|Prior launches second Lyon attack|
|Dybala hails Messi as ´our Maradona´, wants to play with Neymar|