MIAMI - Fourth seed Elena Rybakina powered past Florida resident Madison Keys 6-3 7-5 at the Miami Open on March 25 and will next meet a well-rested Maria Sakkari after the Greek eighth seed got a walkover into the quarter-finals.

Rybakina was more efficient than Keys, winning just over 80 per cent of her first serve points and converting three of her eight break points during the 84-minute encounter.