‘Will this be the last time I see him?’ I wondered as I trod the familiar route down Wimbledon Park Road on Monday. I was off to see Roger Federer – a month away from his fortieth birthday – taking on Lorenzo Sonego in the fourth round. There were two other matches scheduled on Centre Court – Novak Djokovic against Cristian Garin, and 17-year-old Coco Gauff against the former number one Angelique Kerber – but both felt almost beside the point. That’s the danger with extreme partisanship: it can suck the excitement out of everything else. When I watch other players, I judge them by Federer’s standards. And no one measures up.