Just to clarify, no "expectations" just would you do it. Not even out of sportsmanship (personally I don't think it applies under sportsmanship) moreso the desire to complete the tournament and determine the "true" tournament champion.
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So, the questions is still posed would you "take the def" or "offer to reschedule" knowing that your offer maybe rejected or accepted. Either way. what would you do???
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Sorry, I thought my response made my position clear. The answer "would I do it" depends on the circumstances (the nature of the tournament, how high a level it's at, how much is on the line). If it was an "official" sanctioned serious tournament governed by rules, yes, I would do it. If not, if it was some sort of semi-serious loosely-governed tournament, I'd probably want to win "fairly" in the manner you describe.
And yes, it has *everything* to do with sportsmanship, which includes as a subset the "desire to complete the tournament and determine the true tournament champion" as you aptly put it. Good sportsmanship includes not only playing fairly, being a gracious winner/loser, and so on, but also includes a respect for the integrity of the sport and winning and losing "fairly." And all things being equal, obviously as you say it'd be better to win in competition than to win by illness default.
I have to say though (as someone who's practiced better sportsmanship than most people I've played against, and as someone who believes in good sportsmanship and "giving all possible benefit to the opponent") that at a certain point, a match is a match and rules are rules. Once we start picking and choosing rules to selectively ignore or follow based on a subjective code of ethics, then things can become tricky.
Here's some examples off the top of my head of what I'm talking about. What if you know your opponent, going into the final, is playing at only 40% capacity because of a serious ankle injury he suffered late in the previous round's match? Do you offer to reschedule your final until he's fully healed so you can hopefully win "fairly"? What if his mother died the day before, and he's decided to finish the tournament anyway, but you can see from the first point played that he's in no emotional shape to play a tennis match and has no chance of winning? Do you offer to reschedule?
Again, when a player enters a tournament, he/she tacitly accepts that things like illness or injury or emotional trauma may occur, and that's part of the risk of choosing to play sports.
I could also add that hopefully that will not be your opponent's last tournament, and if he's that good, he'll have ample opportunity to enter many more tournaments in the future....and who knows, maybe you'll have the opportunity to meet again and have a competitive final.
Of course, as I also said, if the "tournament" is 8 people playing for no prize money as part of a local club gathering, an offer to reschedule in the case you described is probably fair enough. Anything more than that is "part of the game" and you should without question take the default.