T3nnis.TV (T3N) is a great Ratio Based Sports tracker for tennis fans. It has lots of torrents that start from the 1970's and keep going while tournaments are taking place in the present.
You have to keep a ratio of 1:1 for the torrents your download. There are some FreeLeech (F) torrents, as well as torrents with double upload (x2) or silver torrents (S) for which only 50% of their size is counted towards your download stats. Requests can be made only in the Forums. Donations are open, via Bitcoin and PayPal. Through donations you can get some Upload credit.