
Felix Auger-Aliassime was unable to explain why he suffered with cramping as the seventh seed was forced to retire from his first-round match against Nuno Borges at the Australian Open.
The Canadian, who returned to the world’s top-10 after a comeback year and reaching the US Open semi-finals last season, retired while trailing 3-6 6-4 6-4 to Portugal's Nuno Borges.