That's how hot it can get in Kansas City this time of year, and that's the temperature at which pitcher calves catch on fire and burn. (Ichiro attribution in link is apocryphal. Ray Bradbury reference apropos of very little.)
Shaun Marcum, used to considerably milder weather in the north (despite being born in Kansas City), took a no-hitter into the 7th last night, then lost the no-hitter and had to come out of the game because of cramps in his right calf. "I was tired after I warmed up," he joked.
Another tough loss for Gilgameche, our conquering hero.