A bit of dialogue for you to (fix up and) put in something:

1: So, the marathon you're running is three days long?
2: Not quite. It's three marathons on sequential days. They're a tournament.
1: Won't everyone be too exhausted to run in the second and third race?
2: Sure, yeah. That's part of what makes it hard. The first day we have four marathons with anyone who enters. The top fifty in each race compete on the second day in two marathons of a hundred people, and the top twenty-five in each of those run in the Master Race on the third day.
1: You're calling the final marathon the "Master Race"?
2: Yeah.
1: You might want to rethink that.