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
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RookiesLeaderotron
Mega Patate
Big Lose
Clay 
Grass 
Hard indoor 
Hard outdoor 
attente