I'm completely new to this forum (and photography

), but I've been receiving the newsletter and thought this is the right place to ask this question.
I like to go to tennis tournaments and take pictures of the players there. Now that I'm trying to improve, I can find tons of tips on the 'action shots', but not for the portraits I like to take after a match/ training session.
This is what I mean with those portraits:
DSC06913 on Flickr - Photo Sharing!
I've been thinking of ways to make these more interesting, but I can't think of anything. Of course there's maybe a little more time after training instead of a match, but most of the time I'm not the only one asking and I need to be quick to take the photo, before they walk away.
I use a Sony H9 camera.
If anyone has an idea for me to try, I would love to hear it.