I think the AO winner will be Nole. Djokovic debut at the 2015 AO was with part of fortune on his natal Venus, very lucky.
RG winner will be Nadal because he has the very lucky Jupiter conjunct midheaven transit during RG.
Wimbledon winner will be Murray. During Wimbledon he will have Moon trine Jupiter transit. Very lucky.
USO winner is harder to predict.