It's hard to believe that some of today's top pros once had to qualify—and often together.

Meanwhile, Daria Kasatkina returns to the Top 10—and even sets a new career-high—after winning San Jose.

Reviewing performances from three of the game's latest champions, and what their title runs may mean.

The Wimbledon runner-up eased past surprise finalist Yoshihito Nishioka in straight sets to win his second title in Washington, D.C.

Nishioka has had one heck of a week in D.C., and we think he can finish it off by pushing the red-hot Kyrgios a bit.

The Russian will play Rafael Nadal next in a rematch of their historic Australian Open final.

If you haven't seen Nishioka's travel vlog you should definitely check it out.

Nishioka scrapped his way to a one set lead, but a calf injury ultimately derailed his chances. 

After a brief trip to Tokyo, Nishioka is back in the U.S. to face Jack Sock for the second time in three weeks.

The American demolished Yoshihito Nishioka, 6-2, 6-3, in just over an hour on Wednesday.