She has suffered a 6-3, 7-5 defeat to world number 21 Marta Kostyuk after coming through qualifying to secure a main draw berth at the tournament.

The Ukrainian was also responsible for Sun's first round defeat at the Olympics.

>> More Tennis News

Other Tennis News

20 Nov: Carlos Alcaraz admits it may be impossible to live up to the legacy of fellow Spaniard and tennis great Rafael Nadal

19 Nov: Jannik Sinner claims ATP Finals crown, with doping case still pending

15 Nov: Doubles tennis specialist Erin Routliffe's confirmed she'll remain with Canadian partner Gaby Dabrowski ... at least for now

15 Nov: Taylor Fritz has produced a comeback three-set victory over Alex de Minaur , boosting his hopes of reaching the ATP tennis finals last-four in Turin

13 Nov: A couple of former US Open tennis champions have been confirmed for the women's ASB Classic

12 Nov: To the ATP tennis finals..

11 Nov: Tennis Channel journalist Jon Wertheim stood down for comments about Barbora Krejcíková

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