Nick Kyrgios was booed off court after he appeared to stop trying against Mischa Zverev at the Shanghai Masters.
The Australian patted the ball over the net several times when serving as he lost the second-round match 6-3 6-1.
He also began walking back to his chair before a serve from qualifier Zverev had landed, argued with a fan and received a code violation for swearing.
It came a day after the 21-year-old said he was “bored” during his first-round victory over Sam Querrey.
Kyrgios is ranked 12th in the world after winning the Japan Open on Sunday.
It is the highest ranking he has reached in a career which has seen him fall foul of the tennis authorities for his behaviour.
Kyrgios was last year fined $1,500 for a foul-mouthed outburst while playing in Shanghai.
That came two months after he was given a suspended 28-day ban for making a sexual comment about Stan Wawrinka’s girlfriend during a match.
Earlier this year, his attitude was questioned after he lost convincingly to Andy Murray in the fourth round at Wimbledon.
Article source: http://www.bbc.co.uk/sport/tennis/37630038