Our legendary tennis expert in Australia, Mats Wilander, was in awe of Roger Federer's accomplished win over Jo-Wilfried Tsonga.
Up next for Federer is Andy Murray in a hotly-anticipated Australian Open quarter-final, a rematch of 2012 Wimbledon and Olympic finals at the All-England Club in London.
The two players shared those big matches one apiece, of course, but Wilander said on his live Eurosport post-match show that the Swiss ace is rolling back the years at the moment, which could prove a huge threat to Brit Murray's hopes of adding a third of the four Grand Slam titles to his trophy cabinet.
Elsewhere in the men's draw, Novak Djokovic will meet Stanislas Wawrinka in a rematch of last year's show-stealing five-set war Down Under. Rafael Nadal, meanwhile, will meet Grigor Dimitrov for a spot in the last four.
GS&M decided to ask fans at the arena who they preferred: Nole or Rafa?
Speaking of Nadal v Dimitrov, the Bulgarian became the first player from his nation to reach the last eight of a Grand Slam. GS&M profiled one of the stories of the tournament so far:
Finally, catch up with highlights across Monday's schedule, from Murray to Federer and more, with Mats' round-up: