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The under-21 tournament has made a lot of changes to traditional tennis rules. 

The tournament after the WTA Finals, it's a second chance for many players.

See how much you know about the final Masters tournament of the season.

See how much you know about the year-end championships.

See how much you know about the previous champions of the only Asian Masters event.

The Japanese player has had a breakthrough season in 2018.

Right after the US Open, players jet over to Asia to compete in some important events.

See how much you know about the newest addition to the sport. 

Croatia, France, Spain, and the United States will battle it out for a spot in the finals.

See how much you know about the last time an American man won a Grand Slam.

See how much you know about Federer's accomplishments at the final Major of the year.

Test your knowledge on the newly renovated stadium in Flushing Meadows.

See how much you know about the records the Serbian has set in ATP 1000 tournaments.

See how much you know about the home of the Rogers Cup.