MIAMI, FL, USA – Who is the lowest-ranked player left in Miami? Whose famous footsteps is Serena Williams looking to follow? And how many hours has the indefatigable Irina-Camelia Begu spent on court?

With the field at the Miami Open now whittled down to 16, wtatennis.com and SAP thought it time to go looking for answers…

381 – Irina-Camelia Begu has spent 381 minutes on court thus far, more than any other player in the tournament.

69 – World No.69 Heather Watson is the only player left in the draw ranked outside the Top 50.  

21 – At 21 years old, Madison Keys is the youngest player left in the draw. It is the first time in the tournament’s 32-year history a teenager has failed to make it to the fourth round.

20 – Serena Williams is on a 20-match winning streak going into her encounter with Svetlana Kuznetsova; her last loss came to Caroline Wozniacki in the 2012 quarterfinals.

15 – Fifteen of the 16 remaining in the draw have won a WTA singles title. The odd one out is Johanna Konta, who, at No.24, is also the highest-ranked player on tour not to have reached the winner’s circle. 

11 – The number of different nationalities represented in the fourth round – Romania leads the way with three players.

10 – Ten of the remaining players have never reached the quarterfinals in Miami (Timea Babos, Timea Bacsinszky, Begu, Keys, Konta, Ekaterina Makarova, Garbiñe Muguruza, Monica Niculescu, Elina Svitolina, Watson)

9 – Eight-time Miami champion Serena Williams remains on course to become only the third player to lift the same WTA even nine times or more, after Martina Navratilova (Chicago, Eastbourne, Wimbledon, Washington, Dallas) and Steffi Graf (Berlin).

8 – Eight of the of leading 16 seeds reached their appointed fourth-round slots.

7 – Of the players left in the draw, seven have been ranked either No.1 or No.2.

5 – The No.1 seed has reached the quarterfinals (or better) in each of the past five years – Caroline Wozniacki was the last to fail, losing to Andrea Petkovic in the fourth round in 2011. The top seed has lifted the title on 13 occasions.

4 – Four former champions are still in contention: Williams (2002, 2003, 2004, 2007, 2008, 2013, 2014, 2015), Kuznetsova (2006), Victoria Azarenka (2009, 2011) and Agnieszka Radwanska (2012).

3 – For the third straight year, three unseeded players have made it through to the last 16: Babos, Begu and Watson.

2 – Azarenka remains on course to complete the Indian Wells-Miami double. Graf (1994, 1996) and Kim Clijsters (2005) are the only players to achieve the feat.

1 – Watson received one of the tournament’s eight wildcards; only once in the past five years has a wildcard failed to reach the last 16 in Miami.

0 – Konta and Watson are bidding to become the first British player to reach the quarterfinals in Miami. Jo Durie (1988) also reached the fourth round.