In the third set, when Federer was 0-3 behind the rest of the game, Federer was very dissatisfied with the referees handling of changing the ball and racket, and he questioned the referee. In the final set, Federer asked the referee about changing the ball, but the referees answer was not clear, which led to his failure to change the shooting in time.
One wave is not flat, another wave is rising. The unbalanced Federer served the ball directly to the stand, and the referee subsequently penalized Federer. This once again caused Federers discontent. He went directly to the referee and confronted him. He asked why he had to punish himself for breaking the law. Whats the rule today? The referee said that you put the ball in a very dangerous position and it was beyond the control of the caddie.