Pattern that happens right before Grandslams

This pattern happens a lot of times in the matches before grandslams. The best players will not play 100 % because they will not risk injuries so you have to be careful backing them and look more for value trades, but be careful because going against a favorite can cost a lot of €, so, plan it or just risk with your profit when your intuition says there is a chance, not a simple chance, a GOOD chance.