Not when it comes to how DFS tennis works. Yet a significant consideration is that certain players play better on certain surfaces. We would encourage you to check on players’ history at individual tournaments and their history on certain surfaces.
It does not affect DFS tennis like other DFS sports like the NFL, NBA, or MLB. Even if a match is delayed because of weather, they will make it up because tournaments occur over several days. Tennis tournaments pretty much always finish.
Yes, DFS is legal in all but six states across the country, and the platform you play on will use your location to help you determine your eligibility.