Purvis, who verbally committed to Rick Pitino's program last month, is rated the No. 1 point guard prospect in his class nationally, while Blackshear, a likely McDonald's All-American, signed with the Cardinals last November.
"It should just be a lot of fun me and Wayne Blackshear competing against each other," Purvis said. "Hopefully we can come out with the win, but it should be a lot of fun."
Purvis, who said he hasn't spoken with Blackshear about the upcoming game, has led his high school team to an 18-9 record so far this season and scored 29 points in a loss to Ravenscroft last week.
"The season is going good," Purvis said. "We're having some growing pains because we're [young] but we're getting better and better as a team."
One of the nation's best players, Purvis looks forward to playing in front of Louisville fans for the first time.
"I want to show Louisville fans that I'm a good competitor and I play hard," Purvis said. "That's about it."
Purvis said he's been following Rick Pitino's Cardinals closely this season.
"They are doing really good," Purvis said. "I think they really need a little more depth but I like how they fight even when they're down and come back and win games."
Blackshear will play two games in Louisville this weekend. His team will also play Western H.S., led by 6-5 forward Ryan Taylor, Saturday at 8:00 at Eastern High School.