All the rules for the Top 20 bet can be found here.
(14) Airwolf110 - Alex - anekfu - babass - ChipAndChargeDaez - chucknorris - daviscupchamp - frenchnounours - Hawkeyekuez - huss - josemobilette - kayoo83 - pulpipi - tweenerschaez -
LLTL
ATP
WTA/Double
Yearly
Race
attente
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Rookies
Leaderotron
Mega Patate
Big Lose
Clay
Grass
Hard indoor
Hard outdoor
attente