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Since 2006, the Champions Series is a series of tennis tournaments designed for former members of the ATP tour. The Champions Series consists of tournaments played in select markets where top players of the sport compete in a round robin format with a champion crowned on the last day of each event. Eligible players competing on the Champions Series have either held a Top 5 singles ranking; been a Grand-Slam singles finalist, or a singles player on a championship Davis Cup team during their ATP tour playing careers. The Champions Series allows one wild card of their choice at each event. The series is produced by Inside Out Sports & Entertainment, based in New York City. The minimum age to participate in a tournament is 30. Starting in 2009, some tournaments use a six-player field, and the top two automatically advance to the semifinals, while the other four competitors have to play in order to advance to the semifinals. All matches are two sets each, with a tiebreaker to ten points (must win by two) if the match is tied at one set each. ==Sponsorship== 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.〔http://www.prnewswire.com/news-releases/powershares-qqq-signs-multi-year-deal-to-become-title-sponsor-of-champions-series-132303038.html〕 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 an 8-game pro-set for the championship. Prior to PowerShares QQQ, Outback Steakhouse served as the title sponsor of this seniors' league (as before Outback, the series was known simply as Champions Series Tennis). No matches were played in 2013 as the series realigned from the fall to the spring, the next matches will be in March and April 2014. 〔http://www.powersharesseries.com/〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Champions Series (senior men's tennis tour)」の詳細全文を読む スポンサード リンク
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