The Champions Series consists of tournaments played in select markets where top players of the sport compete in one-night, four-player events with two one-set semifinal matches and a one-set championship match played in one evening.
In October, 2011, PowerShares QQQ signed a multi-year agreement with the Champions Series to become the title sponsor of this national tennis league of erstwhile ATP professionals.
[1] A new match format was introduced to complete all play on a single evening, with only four players involved.
The new format is two semi-final matches consisting of a best-of-one-tiebreak set, followed by a one-set final for the championship.
[2] Players are ranked based upon performance in each event and a cumulative total is kept each calendar year.