Nick Kyrgios, of Australia at US Open. (Source: AP)

Nick Kyrgios was fined a total of $5,500 for bad behaviour during his U.S. Open first-round defeat, organisers said on Thursday.

Kyrgios, seeded 14th, smashed his racket and cursed as he expressed his frustration during a 6-3 1-6 6-4 6-1 loss to fellow Australian John Millman on Wednesday.

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The 22-year-old received a $3,000 fine for ‘audible obscenity’ and a $2,500 fine for ‘abuse of rackets and equipments’, said a U.S. Tennis Association statement.