World number five beats seventh-seeded Sabalenka of Belarus 6-2, 6-4

Serbian tennis great begins title defence with 7-6, 6-4 second-round win over American Cressy

World number one opens her WTA Finals campaign with 6-2, 6-3 victory over eighth-ranked Russian

Fritz, Isner, Tiafoe and Cressy record straight sets victories over their opponents in openers

Belarusian beats Tunisian rival 3-6, 7-6, 7-5, Greek star downs American 7-6, 7-6 as WTA Finals kick off

Serbian tennis great ready to defend Paris Masters title, hopes for strong finish to tough year

Canadian tennis star claims 6-3, 7-5 win in final for his third silverware in as many weeks

World number one will be the biggest threat when season-ending WTA Finals kick off

New mixed teams event, to be held in Australia, replaces ATP Cup, offers ranking points

Serbian star hopes to get an answer over his participation at Australian Open ‘in the next few weeks’