The Australian Open is proving one for the ages—just not the aged. As the AP reports, Roger Federer failed to defend his two consecutive titles on Sunday in a stunning loss to 20-year-old Stefanos Tsitsipas of Greece. Tsitsipas becomes the first Greek to advance this far at a major, but the fifth player on Sunday to achieve their first berth in a Grand Slam quarterfinal—four of whom advanced at the expense of a Grand Slam champ. A look around the courts in Melbourne: