And on Monday, U of L head coach Rick Pitino was back in Las Vegas spending time with Zimmerman at his high school.
Zimmerman's mother, Lori Stevens, said Pitino came to the high school and chatted with the family for close to an hour. He then watched the 6-foot-11, 225-pound Zimmerman in a practice.
"It went great," Stevens said. "It's pretty much the same thing he's said before, but we talked a lot about trying to get in an unofficial visit sometime this summer.
"When we go to Indianapolis (for an AAU event) we might come a day or two early and drive down for an unofficial visit. He talked to Stephen about his season and said he's done good."
Zimmerman has a long list of offers that includes many of the nations elite teams. Stevens said he might narrow it down soon.
"We're thinking more and more than he might need to get it down to eight or 10 schools," she said. "We also want to be fair to the coaches, so they can go recruit other kids, maybe just try to start thinking who could get officials (visits).
"Stephen's not really receptive to that right now, but I think he might have to sit down and start thinking about it when his season ends."
Stevens said U of L's attention they have been paying her son hasn't gone unnoticed.
"Definitely, coach Pitino is very impressive," she said. "(Stephen) likes him and likes to interact with him a lot. Louisville is very high on his (mind)."
Zimmerman is averaging 16 points a game for Bishop Gorman, which plays Reno High in the semifinals of the Nevada Division I state tournament on Thursday night. Bishop Gorman has won two state titles in a row.