William Hill 开的赌盘供参考：
Novak Djokovic to win more than 20 Grand Slam Singles Titles (Djokovic 超过20个大满贯）
赔率1.67倍
Novak Djokovic to have won more Grand Slam Titles then Federer or Nadal by the time they all retire （三人退休的时候，Djo大满贯最多）
赔率5倍
目前大满贯数：Federer 20, Nadal 17, Djokovic 15