My four contract players are all French and all ranked 25-50 in singles. I entered them all in the Fed Cup in both singles and doubles. I assumed, based on my previous two games at lower levels of difficulty, that 25 would not be good enough to make the French team, but being a patriot, I made a grand gesture.
As I expected, Emily was informed that she wasn't good enough for the team. What I did not expect was that the next two girls (Emilie and Pauline) were informed that France did not qualify for this round (which was the first round) of the Cup. I was puzzled that Florence did not receive the same message, but became completely lost when told that she was on her way to compete in the Cup (as the doubles partner of a woman I had never heard of).
As long as I am on the topic of bugs, there's another one (which may fall into the category of design decision). Most nations have flags in color on the game screen, but a few (including the United States) are in black and white.
And one more suggestion for the next full version: It looks like you have enough room to increase the size of the players' pictures by about 50% in each direction and still leave an attractive margin around them.
And I also hope you will somewhat increase the number of real photos of real players, though I realize you might have to pay for the rights to use them. I would hope that many of the real players would provide publicity photos if you sent them a copy of the game (so they could see that they weren't being slandered or made fun of).