Tsui contributed to the Dolphins’ 9-0 win over St. Joseph’s (L.I.) on Friday with 8-4 wins in No. 4 singles and No. 1 doubles. In a tight 5-4 victory over Hunter on Saturday, he also won 8-4 in the first-doubles flight and won 6-4, 7-6 (7-2) in No. 4 singles.