What Actually Happens When the Rally Gets Long
The gap between them is not really about power or ranking points. It shows up in rally length. In points that end inside the first four shots, serve plus one and return dynamics, the two players are close to interchangeable; raw execution decides those exchanges. Once a rally stretches past six shots, shot-by-shot data compiled by the Tennis Abstract charting project shows Sinner's win rate climbing to around 69 percent against Alcaraz, versus roughly 55.6 percent for Alcaraz in that same extended-rally window.
Alcaraz has been candid about why. After a 2025 US Open final loss he pointed to Sinner's return of the second serve as the hinge of the match, noting that because Sinner was "returning really well the second serve," he "was in position to attack the second ball every time." That single tactical thread, an elite second-serve return that turns directly into a first-strike forehand, is close to the whole explanation for why long rallies tilt Sinner's way.
Court position confirms it. Alcaraz's default spot is roughly zero to one meter behind the baseline, an attacking stance built to shorten points. Sinner sits further back, around one to two meters, a depth-absorption position that lets him take a fraction more time to load his groundstrokes without conceding the point. Neither position is objectively better; they are two different bets on how a rally should be won.
