Winslow, from Houston (Tex.) St. John's School, is the first official visit by a top-25 national prospect for UCLA for Steve Alford.
UCLA is thought to have a legitimate chance at Winslow, with his brother living in Los Angeles, and a connection between the Winslow family and Alford.
With his fifth visit, it's believed he could officially visit Arizona, Kentucky or Kansas.
Duke is considered very tough competition for Winslow. Fellow five-star prospects Jahlil Okafor and Tyus Jones will visit Duke the same weekend. OKafor and Jones are close and have publicly proclaimed they will go to the same program, Winslow hasn't said whether he'd be part of that package.
Winslow said: "We've talked about it, but we haven't talked about when we're going to decide or how we're going to do anything. The thing with Tyus and Jahlil is that they are pretty set on going to school together, and I've talked with them about it but I have to do what's best for me and they each have to do what's best for them, so if we decide to go play together it would be great, but we have to do what's best for each other and our families."
Winslow has unofficially visited both UCLA and Duke a number of times, most recently both in spring and summer.
• We've learned that another prospect will join Winslow on an unofficial visit at UCLA Saturday. To find out who, go here.
• UCLA is gearing up for a big recruiting weekend October 12th. As of now, Kevon Looney, the 6-9 power forward who is #14-ranked player in the nation, is scheduled to visit officially. Michael Humphrey, the 6-9 center from Arizona, will visit. UCLA is also expecting a number of other elite 2015 prospects to visit unofficially, like Stephen Zimmerman and Tyler Dorsey, and other underclassmen.