Why you lost, not who you lost to
After losing a match, the explanation heard most often is that today was a bad day. It is true, and it is no use. What is useful is the question: how were most of the points lost? Points are not lost at random. They are lost in groups, and the biggest group is what to practise next week.
Four ways to lose a point
Lost points fall into four broad kinds. First, unforced: hit out or into the net on a ball that put you under no pressure. Second, forced: a miss on a ball that was genuinely hard. Third, the other player's clean winner. Fourth, lost on the serve, whether a double fault or a second serve so soft it comes straight back.
Most club players who actually count find that the first and fourth kinds together are more than half. That is good news, because both are fixed by practice, without waiting for the other player to get worse.
A count you can actually keep
There is no need to note every point during play. Do it straight after the match, while it is fresh: recall the points lost in the last two games of each set and sort them into the four kinds. Five minutes, and accurate enough to see a pattern.
If someone is watching, ask them to count one thing only: points lost unforced, under no pressure. That single number changes how you practise more than watching a video of the whole match.
Do this for three or four matches and see which kind leads every time. That is your pattern, not the story of one day.
You have read the pattern. Now what?
If unforced errors lead, the problem is not technique but choice: most of them come from trying to end the point too early. The matching practice is twenty target rallies without trying to win, adding pace only once you get there.
If forced errors lead, the other player may be a level above you, or you may be standing in the wrong place. Notice which side and which height the misses come from, and practise that ball in particular.
If the serve leads, this is the quickest kind to fix, because the serve is the one ball nobody interferes with. Get the second serve landing nine times in ten first, and think about speed afterwards.
If the other player's winners lead, be pleased: it means the rest of your game is good enough to force them to take risks, and this kind falls away on its own once you meet people at your own level.
If you play doubles
In doubles, add one question: whom were the points lost at? If nearly every ball comes to you, the other pair has read that you are the weaker side, and the answer is not to hit better at once but to change position, so your partner gets more of the ball.
Another pattern particular to doubles is points lost at the net, passed or on a missed volley. If many go that way, both of you playing back from the baseline in the next game usually works faster than trying to volley better mid-match.
The patterns people overlook
One pattern outside the four, and common, is points lost in a run: three or four in a row after a point that should not have been lost. That is not technique at all; it is carrying the last point's frustration into this one. If you see it, what needs practising is the routine between points, not the swing.
Another is losing many points in games you led 40-15 or 40-30. Many players ease off when ahead and lose the whole game. If that is you, make yourself a rule: play the points you are ahead in exactly like the ones you are behind in.
From one match's notes to a season's record
In THE SET.'s sessions the organiser records the match results after each session, and all of them sit in the member's record. Seeing several matches in a row shows the pattern more clearly than recalling one match at a time. Sign up and start with the first match.
General guidance, not a research finding.