Ray Lewis is one of the best player in the NFL ever. For one of the biggest traditions he would do a dance before every single game.
Players do traditions too they do some cool stuff. lebron James does the chalk as he comes out to play the game he grabs some chalk and throws it in the air.
There are also traditions on game day. Some teams do stuff every game day . One team comes on the field and every player has sparklers.
There a lot of ways to do rituals as some people wear different kind of clothes for good luck. One of them in this website sleeps in the opponents shorts before the game.