Riske had stunned world number one Ashleigh Barty in the last round, and pushed Williams all the way before the 23-time Grand Slam winner's power ultimately told.
URiske umangalise owadla umhlanganiso emhlabeni u-Ashleigh Barty emzuliswaneni wokugcina, wabe esephushela uWilliams emuva esikhathini esingaphambi kwesikhathi sama-23 kugcina kusho owanqoba i-Grand Slam.