Singapore - Who has enjoyed the smoothest passage to the semifinals? What does Dominika Cibulkova require to break new ground in the rankings? And how long has marathon woman Svetlana Kuznetsova spent on court?
These are just a few of the questions answered in a BNP Paribas WTA Finals Singapore presented by SC Global semifinal edition of wtatennis.com's By The Numbers.
600 - Svetlana Kuznetsova is bidding to register the 600th win of her career when she steps on court against Dominika Cibulkova. Only four other active players have reached this mark (Serena Williams, Venus Williams, Maria Sharapova, Jelena Jankovic). By lifting the title she will join Maria Sharapova in 17th place on the all-time list for match wins.
399 - Since the US Open, Kuznetsova spent more than 1,600 minutes on court chasing a place at the WTA Finals. And things have not got any easier since arriving in Singapore, her three round-robin matches keeping her on court for a combined total of 399 minutes.
62 - Kerber's three victories this week have taken her 2016 tally to 62. The only other year she passed the 60-win mark came in 2012 (60).
19 - Kerber is the 19th player since the introduction of the round-robin format in 2003 to win all three matches. Seven - Clijsters (2003), Henin (2007), Venus (2008), Serena (2009, 2012, 2013), Kvitova (2011) - of those 19 went on to lift the title.
30 - Including her three round-robin matches, Kuznetsova has been taken to three sets 30 times in 2016, winning 22 of them.
11 - On Friday, Radwanska saw off Karolina Pliskova to register her 11th win at the WTA Finals. Serena Williams (26) and Maria Sharapova (21) are the only active players to have more victories to their names.
8 - Kerber is attempting to become the eighth player to win the US Open and WTA Finals in the same year; the other seven are Chris Evert (1975, 1977), Martina Navratilova (1983, 1985, 1986), Steffi Graf (1989, 1993, 1995, 1996), Monica Seles (1991, 1992), Justine Henin (2007), Kim Clijsters (2010) and Serena Williams (2012, 2013, 2014).
7 - The winner of Kuznetsova (No.8 seed) and Cibulkova (No.7 seed) will be the lowest seed to contest the WTA Finals championship match since No.7 seed Venus Williams in 2009.
6 - Cibulkova is projected to reach a new career-high ranking of No.6 should she reach the final and could rise as high as No.5 by winning the title.
4 - Radwanska's round-robin wins over Pliskova and Garbiñe Muguruza doubled her 2016 Top 10 wins to four. Prior to this week, she had only beaten Petra Kvitova at Indian Wells and Roberta Vinci at Doha.
2 - Cibulkova made it out of the group despite losing two of her three matches. Radwanska achieved the same feat 12 months ago, going on to lift the title. The only other players to make it out of the group with this record were Amélie Mauresmo (2003), Venus (2009), Zvonareva (2011), Jelena Jankovic (2013), Radwanska (2014) and Kvitova (2015).
1 - Only one of the semifinalists, Radwanska, has reached this stage of the tournament before (2012, 2014, 2015). Cibulkova is making her tournament debut, while Kuznetsova (2004, 2006, 2007, 2008, 2009) and Kerber (2012, 2013, 2015) have suffered multiple round-robin exits.
0 - The number of matches Kerber has lost en route to the semifinals. The last player to win the WTA Finals after going undefeated in the round robin was Serena in 2013.