The ATP World Tour is integrated with the second tier ATP Challenger Tour and the third tier ITF Men's Circuit, as a single, unified global ranking system is kept, the ATP Rankings.
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For women, a player's results on both the WTA Tour and ITF Women's Circuit determine her WTA Ranking.
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A few tournaments, notably the season-ending championship, feature round-robin play where players play initially in a mini-league instead of in the typical single-loss elimination.
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ATP World Tour Finals, the year end championship event on the men's professional tennis tour, formerly known as the Tennis Masters Cup