Buse won his last match against German Daniel Altmaier with scores of 7-6 and 7-5. In another matchup, Cerúndolo took advantage of Sebastián Báez's retirement while leading 6-2 and 4-0. American Aleksandar Kovacevic caused a surprise by eliminating Greek Stéfanos Tsitsipás, while other matches saw victories for Fery, Marozsán, and Duckworth.
Buse continues his flawless run at the American tournament
This article was updated at 11:20.