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.
28 de mayo 2017
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|Incredible Dumoulin usurps Quintana to snatch Giro victory|
|Wehrlein: Button made ´a silly move´ in Monaco crash|
|Hamilton happy to take points and move on|
|The offside rule is crazy - Cahill hits out at Sanchez FA Cup goal|
|I think Rooney wants to leave Manchester United, says Robson|
|Cagliari 2 AC Milan 1: Pisacane late show seals fitting Stadio Sant´Elia farewell|
|I surprised myself! - Ferrari´s Vettel revels in Monaco Grand Prix glory|
|Inter announce Palacio departure|
|Kerber relieved to be leaving clay behind|
|Courtois ready to sign new Chelsea contract|
|Everyone wrote me off - Critics inspired Mertesacker before Arsenal triumph|
|Elgar left red-faced as Somerset collapse|
|Vettel overcuts Raikkonen to end Ferrari´s Monaco wait|
|Lions 2017: Warren Gatland´s backs in profile|
|Lions 2017: Warren Gatland´s forwards in profile|
|Emery never feared the sack at PSG|
|Lions 2017: Memorable moments from tours gone by|
|Kvitova delights in ´special´ comeback win|
|I feel great - Rejuvenated Wawrinka confident ahead of French Open|
|Lions 2017: Key battles that could decide the series|
|Kerber makes unwanted history with immediate Roland Garros exit|
|Barcelona future not in my hands – Paco Alcacer|
|Varane wants to see Mbappe alongside history-maker Ronaldo|
|Iniesta: I needed Busquets´ help to lift the Copa del Rey trophy!|
|Brook facing surgery after second eye socket fracture|
|Lions 2017: The strengths and weaknesses of Gatland and Hansen|
|Man United capable of anything - Lingard eyes glory next season|
|Kvitova victorious in hugely impressive comeback|
|Freiburg´s Grifo signs Borussia Monchengladbach deal|
|Verratti expects to be at PSG next season amid Barcelona rumours|
|Coquelin: FA Cup win was for Wenger and we want him to stay|
|Raiders hold off Roosters with Rapana at the double|
|Blair replaces Bromwich as New Zealand captain|
|Ibrahimovic wanted by ´many clubs´, but he´ll stay in Europe - Raiola|
|Matuidi unsure about PSG future amid Man United links|
|Al-Khelaifi certain Emery will stay at PSG|
|Johnson stars for Red Sox, Strasburg impressive|
|Love says it´s funny to consider Cavaliers underdogs|
|MLS Review: Galaxy win Clasico, Sporting KC beaten|
|He will be at the Wanda Metropolitano – Atletico hint at Griezmann stay|
|Mexico 1 Croatia 2: Hernandez breaks record in surprise loss|
|Luis Enrique hails ´extraterrestrial´ Messi|
|Sharks battle past Stormers, Hurricanes hold on|
|Simpson grabs two-shot lead at Colonial|
|Baker wins Eugene sprint as Gatlin and De Grasse falter|
|Hometown heartbreak for Brook as Spence claims welterweight title|
|De Villiers upset at umpire questions over ball|
|Every player wants to play more – Fabregas cagey on Chelsea future after final omission|
|Tuchel hopes to continue as Borussia Dortmund boss|
|Kompany adamant Stones ´has everything´|
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|Conte clear-headed for close season after Chelsea´s Wembley woe|
27 de mayo 2017
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|Neymar equals Puskas´ record in Copa final|
|Carrick signs new one-year Manchester United deal|
|Barcelona 3 Alaves 1: Messi magic secures Luis Enrique parting gift|
|Angers 0 Paris Saint-Germain 1: Cissokho own goal in stoppage time delivers Coupe de France glory|
|Ridiculous to base my future on one match - Wenger|
|Stokes set for scan on troublesome knee|
|Allegri turns focus to Champions League after ´beautiful´ season|
|Wood denies Miller and Morris as England clinch series|
|At last, Homer Simpson takes his place in Baseball Hall of Fame|
|Eintracht Frankfurt 1 Borussia Dortmund 2: Audacious Aubameyang penalty seals DFB-Pokal crown in sty|
|Scintillating Scarlets trounce Munster to claim Pro12 glory|
|Ramsey wants Wenger to stay after scoring FA Cup final winner|
|On Wednesday it will be clearer – Wenger reiterates stance on his future despite FA Cup glory|
|Wenger should bow out in glory after Wembley thriller|
|Silva attracted by Watford´s ambition|
|Arsenal and Wenger set new FA Cup records|