Abstract: An apparatus worn on the wrist of a tennis or Pickleball player for keeping score during tennis or Pickleball comprising an absorbent wrist sweatband upon which is detachably mounted (by means such as Velcro, snaps, clips etc.), in such a way as to accommodate easy, rapid removal and reattachment by hand, absent the need for tools and without the need to remove any connecting parts between the processor/display unit and the wrist sweatband, a small “watch-like” processor/display unit which, in response to points inputted by the player, displays the tennis or pickleball scores.