Mischa Zverev upset No. 2 seed Tatsuma Ito 4-6, 6-3, 6-4 in the first round of the main draw of the USTA Pro Circuit Maui Challenger on Wednesday at the Wailea Tennis Center.
No. 1 seed and defending champion Go Soeda defeated Aiea's Dennis Lajola 6-3, 6-1.
In doubles, Bradley Klahn and Denis Kudla beat top seeds Devin Britton and Austin Krajicek 4-6, 6-4, 10-5.
Round of 16 competition starts today at 10 a.m. The $50,000 event runs through Sunday.
Admission is $5 daily; $2 for USTA members.