Zayydani has become the first mare to win the Ballarat Cup in 24 years.
And just a Battochi did in 1997, Zayydani completes the Matriarch Stakes-Ballarat Cup double.
Luke Nolen produced a copybook ride to settle Zayydani in fifth position on the rails and then did not go around a horse to claim the listed $500,000 feature.
Top weight Yonkers fought on strongly after racing on pace to get second, while Queensland visitor Vanna Girl, which was also up near the lead, was third.
Favourite Thought Of That led as expected and kicked clear on straightening for home, but faded to finish fourth.
Foxy Frida was one of the runs of the race, being the only backmarker to make significant ground - getting fifth after settling at the tail.
Zayydani provided spring highlight for new training partnership, brothers Ben and JD Hayes.
They have taken over the operation of the famed Lindsay Park after their father and legendary trainer David Hayes moved to Hong Kong, and cousin Tom Dabernig moved out on his own.