Despite multiple attempts, Zverev hardly closed the gap on No. 1 Jannik Sinner, who has barred from tennis competition since February.

Iga Swiatek advanced to the quarterfinals of the Madrid Open after a "more relaxed" day following a blackout while top-seeded Alexander Zverev was upset by Francisco Cerundolo.

Power was restored at the Caja Magica tennis complex Tuesday and the Madrid Open resumed with a packed schedule that included second-ranked Iga Swiatek advancing to the quarterfinals after a “more relaxed” day because of the blackout.