The 33-year-old Croatian qualifier, who is a director of Capital Markets for Wexford Real Estate Investors - an affiliate of the $4 billion investment firm Wexford Capital - rallied to beat Sock 4-6 6-2 6-2.
Pecotic reached a career-high ranking of number 206 in 2015 but temporarily quit the sport due to complications following stomach surgery. He then went on to join Harvard Business School, where he rediscovered his love for the game."I had to leave work early today," joked Pecotic. "I had to send an email to the whole team. My boss let me off. I'm going to have to ask for another day off tomorrow.