There can be a number of issues here. I believe there are a few posts on these forums, and/or the Team Rosters support forums on WP, about ‘fuzzy images’. You may want to do some digging in both forums.
1. By default, the plugin uses 150×150 square images for players and team logos. You can change that, but you might start by trying 150×150 images (player photos and team logos). When you get the square photos looking good, start playing with plugin settings, the profile code, and/or CSS.
2. Take a look your Dashboard -> Settings -> Media and see how your thumbnails are being uploaded. Mine is set to 150×150 in the links below
They look pretty good on the dev site … here and here.
If you are going to change the profile template (code or CSS) to a non-square aspect ratio, like 169×155, you may have to adjust this setting.
If you can send a link to one of your player profile pages with a fuzzy photo, that would help me help you.
Let me know.
-Mark