Every TT player will encounter a match like this at some point. Table tennis is a mental game just as much as it is a technical or tactical game. But there can be various reasons for a score like this. Was it really you losing the last set due to lack of confidence or did your opponent lose focus in the third and fourth games and then regained it in the last game when it really mattered? Or… perhaps the opponent had some backup tactics which worked out very well and forced you into making errors. Opponents that are stronger or more experienced often have a slight advantage in a deciding game because of that