A bit unfair. Team players may only play a match or a game once or twice a week, and share the physical and mental strain among all their team-mates. Athletes may only run or perform in a ten or twelve one-or-two day meets a season. Tennis players can play 5 or 6 matches a week, in a year-long season, and in singles, there's no-one there to share the load.
Having said that, in the name of good sport I always like to see tribute paid to a player's conqueror, even if there are circumstances that may have affected the result. It's a a courtesy thing.