Then you should understand how tension and turmoil in your mind could drastically lower you level of play.
Yes, Serena Williams made many unforced errors while Andreescu was playing well and then as her level dropped a bit Williams began to play better.
One thing influences the other. It's really quite simple and self evident.
I've seen from personal experience, and on TV, that when someone is getting blown out they sometimes give up and just start going for BIG shots.
Usually they continue to miss and end up losing even worse, but on some rare occasions those shots start falling in, which gives them some confidence and it begins to snow ball.
I think that's what happened in the 2nd set of the final.
When it got to 5-5, both players woke up again.
Bianca reverting back to her good form and Serena once again becoming nervous knowing she was back in the match.
that means she is human
