They are both playing awfully. Falla is an ATP level player but a very inconsistent one at that.
Also, Falla is a horrible player under pressure. You're really seeing that today. The fans are for him but they are probably unnerving him more than they are Fish.
For sure about Falla under pressure, story of his career. Never been one to thrive under the pressure. Weak mental game. Always gets tight in big moments. But this tennis we're seeing from his is absolutely shocking. He is absolutely horrible in all facets today. I literally cannot believe what I'm seeing. No footwork, absolutely nothing on any of his shots or serve, he's doing nothing.
Also, I'm not sold on him being a real top 100 player. He's been in the top 100 a few times now, and just like he may this year, has fallen out every time. He puts in too many performances like this. He also doesn't have a forceful enough game. He does a lot of things well but nothing on a high enough level. His second serve is an embarrassment especially. If you are weak mentally and you don't have the game to make up for it with lots of winners and the like, you are going to be in trouble.
Mardy isn't playing well but he has weapons, and he has more confidence. We'll see if either can step up their games.