Jubb won 6-4, 2-6, 6-2 over Alex Michelsen in the first round of Surbiton on Tuesday.
ANALYSIS Jubb, the No. 308-ranked qualifier, delivered a surprise early in this challenger event with a three-set upset of the No. 60-ranked American. The 24-year-old from England doesn't have a tour-level win so far in his career, with a record of 0-4. He'll face veteran Mikhail Kukushkin in the second round.