Not too long ago Joseph Parker was an amateur, training in an Otahuhu gym, often alone. Now he's in Las Vegas sparring with a man who has mixed it with boxing world champions - and impressing him.
Friday Ahunanya is ideally placed to assess the merits of the 21-year-old heavyweight who is taking his first steps into the complicated world of professional boxing. Ahunanya has a lot of Kiwi experience - he fought and beat Shane Cameron in 2007 before losing to David Tua in 2010.
He is a canny, defensively skilled fighter with a granite chin and a credible record, so you tend to listen when he says that Parker has far more speed in his long arms than either Tua or Cameron.
"Oh, yeah, that's obvious," he says after sparring four rounds with Parker yesterday. "He's a promising fighter. He came out with the jab and used it well. He's got long hands and he's using his long reach.
"I noticed that when I tried to put some moves on him, he backed off quickly, reset himself and then came at me again. I found that a little disorientating."