Personally I find Novak Djokovic is the one who is annoying (and his family too). It's not the first time he pulls out from critical matches halfway through especially playing against big players. I can't really remember the exact matches but Down the Line! has cited:
"It sounds like he gave up big time. But, no one knows how serious or not his condition is right now. However, this retirement is the fourth since 2007: two in Davis Cup play, semifinals of Wimbledon '07, and Monte Carlo - all big matches, right?"
Djokovic pulls out from the match citing sore throat, dizziness and fatigue.That's very unprofessional, isn't it?