ASICS tennis shoes should feel secure before you start chasing the ball. A good court fit is close through the midfoot, but still leaves enough room at the front of the shoe for quick stops.
The team at Smiths can look at heel hold first, then the way the shoe feels when you push sideways. Court surface matters too, especially if you play mostly on hard courts.
Casual players may want comfort over a longer session. More regular players often care more about lockdown and how the shoe holds up through repeated movement.
Bring in your current tennis shoes if you have them. Wear on the outer edge or a loose upper will usually tell us what to check next.