Anyone interested in sports simming needs to check out the newly-formed 400Studios. This is a company composed of several independent developers who had created sports sims, and have now banded together (which makes sense given the economics of these sorts of programs).
They’ve got a number of excellent looking games coming up, but I’m really looking forward to the boxing sim Title Bout. They’ve got Jim and Tom Trunzo, who designed the old Avalon Hill boxing board game Title Bout Pro Boxing designing the game, and it looks like they’re going to make this a very thorough sim, including creating custom boxing organizations, etc.