Why are the score love/15/30/40 in tennis?

It comes from an old French coin, the 60 sou. Tennis was played for stakes. The sou could be broken into four pieces, so each point was worth one quarter of coins, or 15. And 40 was a shortened version of 45. A zero written down is kind of oval shaped. The French would say "l'oeuf",which means egg. The English thought they were saying "love".
p.s.: Deuce, a deux in French, means two to win.