Harrison became only the 10th 15-year-old to win on the ATP Tour when he defeated Pablo Cuevas in the 2008 US Men's Clay Court Championships, joining the likes of Richard Gasquet, Rafael Nadal and Michael Chang.
"It's quite unusual in this day and age to see guys that young break the top 100, it's very tough to do. But he's a very mature kid," Simpson said. "He's got a very solid all-round game and he stays in the points well. He handles the big situations well."
Young, 22, has been destined for big things ever since as a 10-year-old ballboy he had the opportunity to hit up with John McEnroe. Superbrat's endorsement that Young played with hands like another left-hander he knew well, meaning himself, meant his career was always going to be tracked closely.
He will come to Stanley St as the eighth seed.
While those two might represent the future of American tennis, one country whose present is taken care of is Spain. The Iberian nation has enjoyed an inexplicable rise in sporting fortunes in the past two decades and nowhere has that been more evident than in tennis.
There will be no less than eight Spaniards, led by world No 5 David Ferrer, in the main draw. He keeps returning, said tournament director Richard Palmer, in part because of the quality of Auckland's restaurants.
"Ferrer was one of the only players to beat Djokovic this year so he's in some pretty impressive form as he heads to Auckland," Palmer said.
Nicolas Almagro and Fernando Verdasco will be here, along with Juan Carlos Ferrero, Tommy Robredo, Albert Montanes, Guillermo Garcia-Lopez and Albert Ramos.
With Juan Monaco and Juan Ignacio Chela representing Argentina, Colombian Santiago Giraldo and Chile's former Heineken Open champion Fernando Gonzalez also arriving in Auckland in the New Year, Spanish interpreters should not be short of work.