This is a wonderfully coined expression that is quite simple and to the point. I'm sure we've all heard this both referring to tennis and other areas of our lives. Sometimes this has even been used to express the satisfaction of a victory. The victory of an argument or a case, for example, that's been settled. I asked Chap GPT just for fun what she says (yes for me it's a she) about this phrase and it says "point, set, match literally moves from the smallest unit to the w