where did the scoring of tennis come from
Tennis scoring system The origins of the 15, 30, and 40 scores are believed to be medieval French. The earliest reference is in a ballad by Charles D'Orleans in 1435 which refers to quarante cinque (which gave rise to modern 40) and in 1522 there is a sentence in Latin "we are winning 30, we are winning 45". The first recorded theories about the origin of 15 were published in 1555 and 1579. However the origins of this convention remain obscure.[3]