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Nick Kyrgios' first coach Andrew Bulley says he was "upset" to see his former player give up mid-point during one of his matches at the Shnghai Masters, because he knows "how good he can be".

"Can you call time so I can finish this match and go home?"," he asked umpire Ali Nili in his 6-3, 6-1 loss to German Mischa Zverev.

Bulley insists he doesn't think Kyrgios will seek help, insists he has the potential to be a Grand Slam winner and says it's down to him to manage his schedule.

(Photo: Nick Kyrgios, Credit: Getty Images)