It's too bad the article doesn't include more numbers on accuracy - it would be interesting to see if there's a big difference between the ruling of the on-cour

It's too bad the article doesn't include more numbers on accuracy - it would be interesting to see if there's a big difference between the ruling of the on-court judges and the camera system. It'd also be interesting to know how often close calls happen on important points, and how often those are challenged. My guess would be that challenges are almost always used when the point matters, and the low challenge rate is because most controversial calls happen in routine situations like 40-love.