Shanghai - Australian firebrand Nick Kyrgios exited the Shanghai Masters in ignominy for the third year running on Monday, appearing to lose heart during his first-round defeat.
It didn't end there as Kyrgios turned to Dumusois after hitting an ace and sarcastically asked: "Was that borderline poor?".
Kyrgios lost five straight games from 4-4 in the second set in a match that lasted one hour and 17 minutes.
However, during the second set, Kyrgios wasted a golden chance on serve when he was down 4-5, and Klahn pushed the match to a deciding set.
Kyrgios threw a mini temper tantrum in response, telling Dumusois: "I don't care, bro".
The Swiss three-time major victor and former world number three, a wildcard in this tournament, was beaten 4-6 6-4 6-3 by 13th seed Borna Coric.
While not a clear-as-day accusation of tanking - like some others have freely done in the past - Dumusois' comments clearly didn't go down well with the 23-year-old.
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He was later fined $10,000 for unsportsmanlike conduct.
It's hard to keep count of all the controversies Kyrgios has been involved in on the ATP Tour - this run-in can certainly be added to the list.
The talented but erratic Kyrgios has played in Shanghai four times with his best showing being two second-round finishes.
In 2016, Kyrgios patted the ball over the net several times when serving and began walking back to his chair before a serve from opponent Mischa Zverev had landed, leading to boos from the crowd.
De Minaur will kick off his Shanghai campaign on Tuesday against Poland's Vasek Pospisil.
Australian doubles great Todd Woodbridge defended his compatriot, who was also given a controversial pep talk by chair umpire Mohamed Lahyani at the US Open, over the incident in China and said he looked "tired and jaded".
Wawrinka, who is trying to discover his form following knee surgery, took the opener 6-4 but 13th seed Coric roared back and won his 32nd match of the season.
The win over Tiafoe has left Ebden facing a tough second round encounter against world No.7 Dominic Thiem.
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