Big-serving Australian Thanasi Kokkinakis, a qualifier ranked 175th, rallied to upset Federer 3-6, 6-3, 7-6 (4) at the Miami Open. The 36-year-old Federer had been the oldest No. 1 man ever, but he’ll lose that spot to Rafael Nadal when the new rankings come out April 2.
Kokkinakis became the lowest-ranked man to beat a No. 1 player since No. 178 Francisco Clavet upset Lleyton Hewitt in 2003. That upset was also at Key Biscayne.
Federer now has lost back-to-back matches for the first time since 2014, a dip that comes after a career-best 17-0 start to the year.