Whether you are a player or coach and whatever level you or your player plays at, it’s very important before a match to know just what you or your pupil is up against and what to expect.
What information would you want to extract from watching future opponents?

When you play doubles either socially or more on a competitive level what tactics do think about?
Most would think about needing to be sharp at the net, possibly even the need to serve and volley or chip and charge.