Watched the Twins game yesterday afternoon in Milwaukee. Temp was 102 with 70% humidity. They were bringing towels to the pitchers to wipe off almost each inning due to excessive sweating.
The Twins catcher running to first base collapsed 3/4 of the way to the base, but managed to crawl the rest of the way.

Wife and I were in Cincinnati a few years back on opening day against Denver. We found good seats but in the sun. It was so hot that sweat ran down my legs and into my leather boat shoes. When we got to the car, I threw the shoes away. They stunk. Other than waders, I have never had my shoes fill with sweat, not even working in a tobacco field as a teen.

Not fair to either team to play in that Kansas heat. Probably best they cancelled the game.