The two big men, both rising seniors, will leave the door open to return to Duke should the draft process not work out.
Culver averaged 18.5 points, 6.4 rebounds and 3.7 assists last season and played a key role in his team's NCAA Tournament run.
The 6-foot-9 forward served as a reserve for much of the season, but was promoted to the starting lineup during the NCAA Tournament.
Duke athletic department employee Nolan Elingburg and his wife recruited Zion Williamson to help with their gender reveal.
Duke athletic department employee Nolan Elingburg and his wife, Danielle, recruited Williamson to help with their Blue Devils-themed reveal.
Guy is the latest Virginia player to declare — Ty Jerome and De'Andre Hunter announced their intentions to enter the draft Monday.
The junior guard averaged 16.5 points per game during the NCAA Tournament as he helped lead Virginia to its first national championship.
The decision comes one day after teammate and star forward RJ Barrett declared.
Drama in the NBA dominates our look at this week in the American sports world.
Barrett ended the season tied with Zion Williamson as the Blue Devils' leading scorers, averaging 22.6 points per game.