The Challenger series is a worldwide circuit of approximately 150 tournaments located in more than 40 countries. “Up and coming” players gain valuable experience while competing for prize money and points. The amount of points each player receives places them into a rank in order that determines if they get into the Grand Slam.
Daniil Medvedev
Denis Shapavolov
Nick Kyrgios
Kei Nishikori
Tennys Sandgren
Reilly Opelka
Jack Sock
Ryan Harrison
Donald Young
John Isner
