23:19 CET - Another day of top-level tennis comes to a close with Basel sixth Felix Auger-Aliassime (23) seeing off Botic Van De Zandschulp (28) in straight sets 6-4, 6-2.
23:02 CET - Play is over in Vienna as France Tiafoe (25) came from a set behind to beat veteran Gael Monfils (37) - a winner last week in Stockholm. The US seventh seed won their encounter 5-7, 6-1, 6-4.
21:55 CET - The top seed in Basel makes his way into the quarter-finals. Holger Rune (20), the world number six, dispatched Sebastian Baez (22) in style 7-6, 6-1.
Meanwhile in Austria, second seed Jannik Sinner (21) beat Italian compatriot Lorenzo Sonego (28) 6-2, 6-4.
19:49 CET - Dominic Stricker (21) has taken down Basel's second seed Casper Ruud (24) after a match that went the distance. The Swiss player won 6-4, 3-6, 7-6 to knock out his Norwegian opponent.
18:40 CET - Back to Vienna and fourth seed Stefanos Tsitsipas (25) has seen off Czech Republic's Tomas Machac (23), but the Greek star was made to work for it, winning out 6-3, 4-6, 7-5 to progress.
18:05 CET - Basel's seventh seed Nicolas Jarry (28) has been knocked out of the tournament by Ugo Humbert (25) in straight sets 7-6, 7-6. That is the second seed of the day to fall.
Meanswhile, here are our ATP and WTA Flashmoments of the day.
17:06 CET - Alexander Shevchenko (22) pulled an unlikely victory against Taylor Fritz (25) in Basel after a three-hour contest ending in 6-7, 7-6, 7-6.
16:20 CET - World number three Daniil Medvedev (27) made it to the quarter-finals in Vienna after winning against Grigor Dimitrov (32) 3-6, 6-2, 6-4.
15:52 CET - World number 15 Luidmiala Samsonova (24) has handed Lin Zhu (29) her first defeat in Group D of the WTA Elite Trophy by beating her 2-6, 6-2, 6-1, moving her top of the three-woman group.
15:34 CET - A shock in Basel as fifth seed Alex De Minaur (25) is out in the second round. Tallon Griekspoor (27) has vanquished him in straight sets 6-4, 6-3.
14:50 CET - Borna Gojo (25) pulled an upset against Tommy Paul (26) as he won against the American 6-3, 6-4 in Vienna. Meanwhile, in Zhuhai Jelena Ostapenko (26) got past Donna Vekic (27) after a 4-6, 6-4, 6-1 victory.
13:31 CET - Andrey Rublev (25) made it to the quarter-finals in Vienna after defeating Matteo Arnaldi (22) 7-5, 6-3.
11:35 CET - The first result of the day is in as Daria Kasatkina (26) defeats Magda Linette (31) in Zhuhai 6-3, 6-4.
5:42 CET - Starting off with Vienna, Andrey Rublev faces Matteo Arnaldi before Tommy Paul takes on Borna Gojo as well as Daniil Medvedev against Grigor Dimitrov. Stefanos Tsitsipas clashes with Tomas Machac as Frances Tiafoe wraps up the day in Austria with his match against Gael Monfils.
Taylor Fritz in Basel is up against Alexander Shevchenko, while Holger Rune takes on Sebastian Baez.
Finally, in Zhuhai, Daria Kasatkina challenges Magda Linette to begin the day. Their contest is followed by Jelena Ostapenko and Donna Vekic's and Lin Zhu takes to court ahead of Liudmila Samsonova.