Cheeky cheeky... live from DC, London, & Houston, we breakdown the matchups of the big 4, discuss Sinner's grass court game, and offer an alternative way of assessing ATP performance and prospects. The tier system© is a probability-based ranking system that more accurately demonstrates the odds of player success in meaningful tournaments. Unlike the ATP points system, the tier approach© buckets players by who we expect to win, who we are not shocked by when they do win, and who require low likelihood outcomes to lift big trophies.