Talk Tennis Guru
I assumed you'd rely on the strict example of Djokovic or another #1 player but as the photo shows she leads with her hips and shoulders with tremendous racquet lag behind, it is indeed multi-segmental just not like as extreme as Novak.The difference comes further on. She’ll be completing her rotation while swinging arm forward simultaneously. Djokovic will complete torso rotation with arm fully back, no chest flexion, just stretch, then pass the momentum to arm. The marker is exactly what I showed in those still frames: torso already facing the net while arm still trailing.