I visited the ancient city of Copan, Honduras a few years ago. There, the Mayans played a ball game in a two sided court. It was a game of death, if your team lost, you were all put to death.
When I saw the pendant, I immediately thought that this could be a piece of jewelry showing the sport. The pendant is really neat, good find.
http://www.ancient.eu/article/604/I wonder what the other piece, it's very interesting.