Control in sports betting is just based on your analysis, and so if you are wrong then definitely you lost that control. Or if the games suddenly chance, let's say one player got injured and so the outcome might change for the bad and you might lose it as well.
Actually self-control or control depends on your readiness to accept the possibility of the risks involved, in any type of game from the beginning it is clear that risk will always be part of the game, so even if for example you are really very confident with your analysis it does not mean that victory will come, as you said that there will always be room for unexpected things to happen that can turn things around at the end of the game and for the problem of control when losing I think it is clear that it depends on a person's readiness from the beginning, simply even if for example at the beginning your analysis is correct but in the end you lose because of something that happens unexpectedly then you should not lose self-control if only from the beginning you already knew that defeat was still very possible.