All the rules for the Top 20 bet can be found here.
Pas de tournoiIn progress
Hamburg European Open
Leader(s): Toastt3
Geneva Open
Leader(s): MisterCoq
LLTL
ATP
WTA/Double
Yearly
Race
attente
<=
=>

Leaderotron
Mega Patate
Big Lose
Clay 

Grass 

Hard indoor 

Hard outdoor 

attente