Dic: the brass ring

• Our aim is to have the best team in the league - the brass ring is there guys, go and get it.
• The girls’ outdoor track team has grabbed the brass ring seven times.

1. (American) success or a reward that you try to achieve, often by competing against other people.
2. AmE, (informal) the opportunity to be successful; success that you have worked hard to get.

.... http://idioms.thefreedictionary.com/the+brass+ring,
http://engdic.daum.net/dicen/contents.do?query1=EP00006730