Stan Wawrinka

35-year-old says he self-isolated at home in Switzerland and is "feeling better" now

35-year-old Swiss has since been on a rise, making two finals in 2019

18-year-old, ranked 249, says he fully deserved his stunning 6-0 7-6(2) victory over three-time Grand Slam winner

Norman believes 35-year-old has had ‘an unbelievable career’

33-year-old Spaniard is already guaranteed to usurp the Serbian at the rankings summit next week

Russian later called himself "an idiot" and admitted he needed better on court behavior

Serb quit with a nagging left shoulder problem that had troubled him since the start of the tournament

The two close friends have won 2008 Olympic gold and 2014 Davis Cup gold together

34-year-old has a 23-3 losing head-to-head record against close friend and fellow Swiss superstar

Both Swiss stars won Olympic doubles gold in 2008 and a Davis Cup title in 2014