Tennis is a sport where every single point matters.
A 15-40 is way more stressful than a 30-all. A third reversed call in a match plus a point penalty can bring one from 7-8 down in a tiebreak to 8-7 up and serving for the match. One could be dominant in a set, but one singular break of serve at the end will turn the tide of the match.
In a lot of those cases, experience will come in play to ease the heightened pressure of those make-or-break situations. It’s about the nuances in when to maintain a rally versus when to be the aggressor, or how to readjust and protect a point when a player is down to his second serve.