Aussie Open last 2 rounds are at night while US Opens are in the middle of the day. I may be wrong but I don't remember Djoker ever playing Fed or Nadal during the day at the Aussie or at night at the US open which explains his records against them at those respective slams.
vs Nadal: Day matches favor Nadal which helps explain why he's never lost to Nadal at the Aussie but has a losing record at the US
Vs Federer: Day matches also favor Federer which helps explain why Fed did better against him at the US.
vs Nadal: Day matches favor Nadal which helps explain why he's never lost to Nadal at the Aussie but has a losing record at the US
Vs Federer: Day matches also favor Federer which helps explain why Fed did better against him at the US.