"It's much more difficult. The depth of players is much more," Alexander Zverev said of today's Top 30.
The American Tennis Association and USTA have a shared mission of increasing black representation in tennis.
Four Americans are into the round of 16 on the red clay of Madrid.
The 23-year-old is coming up the rankings quickly this year.
The Czech teen is the fifth-youngest quarterfinalist in event history.
The Russian doesn't want the public knowing everything about his life.
The Czech has won eight straight matches at the Masters events.
