Chris Mullin was a surprise attendee at Kenny Atkinson’s first day of training camp as Nets coach, representing his home borough and supporting his longtime buddy.
“I’m good friends with Kenny. We go way back. Just here to support him and support Brooklyn,’’ said Mullin, who estimated he has known Atkinson since “the early ’90s. … I was living on Long Island in the offseason, so I used to play out there in the offseason. So I’ve got a lot of respect for him, great guy.