Pova's best chance to beat Serena is to play her style of tennis and hope Serena has an off day. That can happen, but Serena raises her level whenever she plays Pova so the probability is not high. If Pova tries anything outside her comfort zone, eg throw in variety, the score will be even more lop-sided. On an average day, there are only two women who can beat Pova. She has to accept that and be happy about it. Being third best in the world is quite an achievement. I think this is proof that Pova does not have a mental block against Serena. She believes she can win. It only takes some luck. If she truly believed she has no chance of winning, she would try something different. Pova is in a good spot. The two players who give her trouble are prone to injuries. In a typical tournament, the chance of facing one and the other withdrawing is not insignificant.