Rather random Sports question (help please...)

From my usual monthly quiz (Great brain 132), I give you the last remaining unanswered question:

**72: ** Which letter replaces the question mark in this currently complete sporting sequence: **AG CB DD AS P? **

The phrase “currently complete” leads me to think this is a definitive list of (winners, teams?) for the sport - a new event introduced recently to the Olympics, for example. Anyone have any ideas? ( Here’s hoping it might just click with someone…)

Thanks.