Burruchaga then beat defending champion Camilo Ugo Carabelli via retirement before taking out Gustavo Heide in a three-hour classic. Facundo Mena tends to be dangerous in altitude conditions ...

Alexander Zverev booked an Australian Open quarter-final against Tommy Paul Sunday after surviving a mid-match wobble to oust France's Ugo Humbert as he zeroes in on a maiden Grand Slam title.