Four years after last of her major titles, Japanese 23rd-seed stretches unbeaten run in grand slam last eight.

In a battle of former US Open champions, No. 23 seed Naomi Osaka dispatched No. 3 seed in straight sets to advance to the quarterfinals.

Two-time US Open champion Naomi Osaka earns her most impressive win since returning to the tour by knocking out third seed Coco Gauff.