Pablo Carreno Busta apologised after he stormed off court and angrily threw his kit bag after losing a five-hour, five-set epic to Japan's Kei Nishikori at the Australian Open yesterday.

The Spanish 23rd seed said he was "so sorry," after being booed off when his emotions boiled over following a disputed call in the dying moments of the match. He was ahead 8-5 in the first-to-10-point deciding game when he became embroiled in a long argument with umpire Thomas Sweeney of Australia after a wrong call of out.