MELBOURNE (Reuters) - Nick Kyrgios' participation at next week's Australian Open is under a cloud after he suffered a foot injury and was forced to quit his match against Belgium's David Goffin at the Kooyong Classic on Wednesday.
The outspoken Australian had called for a medical time out at 3-2 in the first set before winning it 7-6(5) against the Belgian and called for the trainer again at 1-1 in the second.
The world number 30 carried on before deciding to quit at the next changeover when trailing 3-2.
Kyrgios, 20, is in good form having helped Australia win the mixed-team Hopman Cup event in Perth last week where he beat British world number two Andy Murray.
The Australian Open, the first grand slam of the year, begins in Melbourne on Monday.
(Writing by Patrick Johnston in Singaopre; editing by Sudipto Ganguly)