Keep a simple running score
Name the two players, then add a point to the player who earned it. If Alex wins three points and Sam wins two, the board reads Alex 3, Sam 2. A mistaken tap can be corrected with minus or Undo.
Undo restores the previous pair of scores. Renaming a player does not change points or create an undo step. Copy score includes both current names and scores so you can paste a finished result elsewhere.
Decide game rules separately
This board counts single points. It does not implement tennis scoring, win-by-two rules, penalties below zero, rounds, or match history. For a game with unusual scoring, add or remove the required number of points yourself.
Clear restores both default player names and zero scores. The page holds the score only while it stays open; it does not create a shared board or synchronize another device. Use the coin flip if you need to choose who starts.