All the rules for the Top 20 bet can be found here.

Pas de tournoi
In progress

US Open
Leader(s): Minijim

WTA US Open

Top 20 ATP

LLTL
ATP
WTA/Double
Yearly
Race
attente
<= =>
Rookies
Leaderotron
Mega Patate
Big Lose
Clay
Grass
Hard indoor
Hard outdoor
attente