Maya Joint's Hong Kong Open run ended on Wednesday with a three-set loss to Maria Sakkari, who came back after Joint took the opener. Joint still sees her season finishing strongly and points to her win over Williams as the moment things turned.
Joint won the first set 6-4 before Sakkari took the next two 6-3, 6-3 to reach the quarterfinals.
Joint called her victory over Williams a "turning point" for her late-season form.
Earlier in the week, she faced fellow Australian Maddison Inglis in Hong Kong.