Open is the pc disc golf term for pro in pdga events. Generally in our leagues, the open divisions should include people who would normally play open or advanced in a pdga event. These players usually take leagues slightly more seriously, especially as a tournament nears. The excess fees allow them to compete for bigger pots. Everyone else refers to masters (40+), most women, juniors, and ams. The am division at leagues is mostly the people who would play intermediate or rec in a pdga event.