The 20-time Grand Slam champion broke his sixth-ranked opponent's serve at love in the ninth game but then had to rally from 0-40 down to hold serve and finally clinch the first set.
Cristiano Ronaldo is quite a perfectionist when it comes to matters on the field. Rarely does he miss a shot but this time he did.
Complaining about the inconsistency of the doping tests in Tennis, the American great added that 'At least I will be keeping the sport clean #StayPositive'.
Eventually, Nick Kyrgios lost the semi-final match in straight sets 7-6 (7-3), 7-6 (7-4) against Croatia's Marin Cilic.