
Jiri Lehecka has warned his giant-killing run at the Australian Open is "not over" after booking a spot in the quarter-finals with a stunning upset of Canadian star Felix Auger-Aliassime.
The unseeded Czech fought back from a set down and held his nerve in the deciding tiebreaker to complete a shock 4-6 6-3 7-6 (7-2) 7-6 (7-3) victory over the sixth seed on Sunday.