Tennis Tracker: Paolini facing Zheng at WTA Finals, Cerundolo through in Belgrade

14:18 CET - Qinwen Zheng (22) has taken the opening set in her decisive Group A match against Jasmine Paolini (28) in Riyadh.

Follow the rest of the match here.

14:10 CET - Denis Shapovalov (25) has progressed in Belgrade, sweeping aside fifth seed Nuno Borges (27) 6-2, 6-4, while Christopher O'Connell (30) is also through after an emphatic 6-3, 6-1 triumph against Daniel Altmaier (26).

12:53 CET - Third seed Francisco Cerundolo (26) is safely through to the quarter-finals in Belgrade after a fairly routine 6-4, 6-4 victory over Roman Safiullin (27). The Argentine will face the talented Hamad Medjedovic (21) next.

10:20 CET - It's another big day at the WTA Finals in Riyadh, with Jasmine Paolini (28) and Qinwen Zheng (22) going head-to-head at 13:30 CET for a spot in the semi-finals. 

Following that match, world number one Aryna Sabalenka (26) - who is already through to the last four - faces Elena Rybakina (25) in a dead rubber at 16:00 CET, with the Kazakh out of contention after two defeats from her opening two matches.

09:00 CET - Good morning and welcome to our coverage of today's tennis!