In Part 4 of our ATP 2025 Year-End Review, we look at the players aged 27–29 — the most complicated group in men’s tennis. They were supposed to take over from Djokovic, Nadal, and Federer. Then came The New Two. We dive into: • Zverev’s stagnant ceiling and why the next dip could get ugly • Fritz maximizing every ounce but needing just one more gear • Medvedev’s “one more run” and what actual change looks like • Tsitsipas falling fast — is a comeback even realistic? • Rublev as the gatekeepe...