Two Different Bodies Built for Two Different Games
Physically, the two are not close. Sinner is 191cm and 77kg; Alcaraz is 183cm and 74kg. That eight-centimeter gap moves Sinner's contact point roughly 15cm higher, which gives him a steeper downward angle on groundstrokes at equal racquet speed and an advantage on serve, since he can generate pace from a taller release point and still get the ball to dip inside the lines.
Alcaraz compensates with movement rather than raw size. His game was built around explosive first steps and a level of court coverage that let him finish points from defensive positions other players would simply lose. The Alcaraz-Sinner rivalry entry on Wikipedia documents a style comparison that recurs across scouting reports: Sinner as the modern aggressive baseliner built on two enormous, high-topspin groundstrokes, Alcaraz as the all-court shot-maker whose variety, drop shots included, invites comparisons to Nadal's early career rather than to any single Big Three player's blueprint.
