Police say after the concert one of the men punched Fleming in the face, causing him to fall and hit his head on the pavement. He is now at Baylor University Medical Center in Dallas in a medically induced coma. His attacker is still on the loose.
"It's devastating to our family, and at some point when he gets healthier then I'll shift gears and worry about what they are going to do with the guy who did this," said Steve Fleming, Jeffrey's father.
The 20-year-old Fleming hails from Orange County. He was a standout player at Newport Harbor High School in Newport Beach before coming to UCLA.
At the university, school is out of session. A youth tennis camp uses the tennis courts over the summer. Fleming was reportedly planning on spending his summer on campus teaching tennis to kids.
The UCLA men's tennis coach says the team is respecting the wishes of the Fleming family and not talking to the media about Jake. But students had a strong reaction to news of the attack.
"If you have a problem with someone you should just sort it out face to face," said UCLA student Bernard Willers. "Sneaking up from behind on someone is not the way to go. If that is what happened, then yeah, that is pretty cowardly."
"It's kind of surprising actually," said another UCLA student. "I wouldn't expect that from a player like that, especially not from this university."
"Probably just somebody being stupid, most likely would be my guess," said UCLA student Christopher Rubino.
No arrests have been made in this case. Investigators are following on quite a few tips from witnesses and they have a very good description of the suspect.