In fact, mixed doubles are men hitting men and women hitting women. Professional players don't bully girls. . . So on Federer and Nadal's side, it is obvious that Nadal is dominant; He hit Federer's backhand with a topspin, causing Federer's SLR to hit the ball over his head. . . If you don't know, try it. Playing backhand with one hand like this is very controlled and basically can't produce good quality.
Li Na may not be able to do it here. Li Na is dominated by grass. Although she won the French Open this year, her style is more suitable for mowing grass. But her tactics are excellent. Compared with Serena, she may not have much strength on red soil.
Generally speaking, Nadal and Li Na have a higher winning percentage in mixed doubles. Although there is not much friction between Li Na and Serena, Federer's contest with Nadal on clay court is still very difficult.