The names and teams aren't important, but here's what happened in July 2008 on a beautiful evening at Nationals Park. The visiting pitching coach went to the mound to talk to his pitcher, who was laboring slightly.
"I can't pitch any more," the pitcher told the pitching coach.
"Are you hurt?" the pitching coach asked.
"No, I just can't pitch any more," the pitcher said. Then he walked off the mound.
He had thrown 90 pitches.