BRISBANE, Australia (AP) — Third-seeded Angelique Kerber secured the first spot in the quarterfinals of the Brisbane International with a 6-3, 7-5 win over Daria Gavrilova on Tuesday. Varvara Lepchenko also advanced with a 6-4, 6-4 win over fellow American Madison Keys, who had ousted Australian Open finalist Dominika Cibulkova in the first round.