The American, upon reaching the round of 16, joined a list of four other players aged 21 or under to claim this feat ...

With wins over Ann Li and Anna Kalinskaya, Coco Gauff and Madison Keys advanced to the Round of 16 -- and four more U.S. players are still in the hunt.

Coco Gauff handled the job much easier today as she routed world No. 62 Ann Li 6-2 6-3 to progress into the Madrid Open round ...