ML's change of tactics is really quite brilliant. He completely changed his style to a modern BH dominant style, starting with the reverse service, then standing near the center of the table as his default ready position for both 3rd ball and service receives, followed by maintaining close to the table. This allowed him to play the ball early and win some points with speed and angles borrowing the speed of the opponent. This also allowed him to play more BH flicks which he did more than usual but still not as much as your typical modern player.
LGY didn't seem to change much, it was just his day. He plays an extremely speed based style, with flatter balls and taking them early. It's a high-risk high-reward style, which lacks stability and consistency, thus the "choking" episodes. When he's on though, he's really on, as no one can keep up with that level of speed except FZD usually. We'll have to see if he can maintain this form against ML tonight.