There are a lot of statistics that Nebraska volleyball coach John Cook keeps close tabs on — opponent hitting percentage is a biggie, as is serving — but in recent years he’s also keeping track of his success when it comes to the challenge review system.
That’s the instant replay system where coaches can challenge a call made by the officiating team during the match. The second referee may reverse a ruling only if the video review reveals indisputable evidence that the referee’s ruling was incorrect.
Of course, success in winning those reviews comes with mixed emotions.