I was wrong. I didn't expect that outcome.
That's a fairly normal thing to say in a sports conversation. In fact, that conversation is fairly easy and straightforward based on the final score and the stats.
Admitting you're wrong in a business conversation can be more difficult or uncomfortable. Practicing that kind of vulnerability helps. Sports small talk is a form of practice. It's just one of the ways small talk can be useful in bigger business conversations.
Speaking of, here's a list of sports topics making news this week.