no, that is a radical position.
in tennis, there are certain facets of a game that creates mismatches and advantages. you must pick and choose.
there is no reason for his conditioning to not be up to par. period.
And when determining "who should win" you have to compare everything. You can't be selective. That makes zero sense.
If his physical condition wasn't up to par with his opponent's it means he had inadequate training, or, his opponent simply had superior training. It's not some cut-and-dry thing where you can say "all players must be equal in terms of how they prepare for a match by default."
It doesn't work that way. All these things are part of the game.