The difference between a round and an oval tennis racket head shape refers to the shape of the racket head.
A round tennis racket head has a circular shape, while an oval tennis racket head has an elongated shape with a wider horizontal length and a narrower vertical length.
The shape of the racket head can affect the sweet spot and the amount of power and control the racket provides. Round racket heads tend to have a smaller sweet spot and provide less power but more control, while oval racket heads tend to have a larger sweet spot and provide more power but less control.
Additionally, the shape of the racket head can affect the player's ability to generate spin. Oval racket heads can be easier to use for generating topspin due to the wider horizontal length, while round racket heads may be better suited for generating backspin due to the circular shape.