Looks good, a couple of suggestions:
- Add custom ranks as an option. While you may not see it as of interest, some will. If the win rate is bugged, then just hide this column only
- Allow the data to be sorted by clicking on a column header
- I assume it'd be a lot more work but just in case it wouldn't be hard to add, add a filter option to allow you to display only players between a certain rating, or with a certain win rate, or with a certain number of games