I should add that this is a classic case for using Code Replacements -- to save time when typing in athlete names. E.g. if you are looking at jersey numbers to match them from the list, you could set up a Code Replacement file based on the photo of the list so that you only needed to type the jersey number into your caption and it would expand to the athlete's full name. Here's more info on how to do that:
http://wiki.camerabits.com/en/index.php?title=Speeding_Up_CaptioningHowever, if that's not your bag, no worries. You could try the 2-up photo view in the preview window that would keep your Athlete List on one side and your current photo on the other side.
Try opening Preview Window in 2-up mode (use the button with 2 rectangles) and then the IPTC Info window next to that. (You can resize the IPTC Info window such that the target photo is rather small, since you have it in the Preview window as well)
In this configuration, you can keep your athlete list open, type captions into the IPTC Info window, advancing to each new photo (with cmd-n or ctrl-n) with the list staying visible. I attached a shot of what I'm talking about.
Maybe this helps? I hope so.
-Mick