Top-30 Mark Williams commits to Duke men's basketball's Class of 2020

Mike Krzyzewski may be 72 years old, but when it comes to recruiting, he's still as spry as ever.

Mark Williams became the sixth member of Duke's 2020 recruiting class Friday afternoon, announcing his commitment the Blue Devils in a Twitter post. The consensus four-star center, ranked No. 30 in ESPN's recruiting rankings, chose the Blue Devils over Michigan and UCLA.

Williams' commitment solidifies Duke's incoming crop of prospects as the top recruiting class in the country according to ESPN. He'll be joined in Durham by five-star guards Jeremy Roach and D.J. Steward, five-star forwards Jalen Johnson and Jaemyn Brakefield and four-star forward Henry Coleman III.

Williams is no stranger to Cameron Indoor Stadium, as the Norfolk, Va., native's sister, Elizabeth, starred on the Blue Devil women's basketball team from 2011 to 2015. The All-American won a WBCA Defensive Player of the Year award in her senior year, has her No. 1 jersey retired at Duke and now plays for the Atlanta Dream of the WNBA.

With the likely departure of current Duke bigs Vernon Carey Jr. and Matthew Hurt for the NBA and Javin DeLaurier graduating, Williams will provide some much needed size on next year's team. The 7-foot center would be the only likely rotation player taller than 6-foot-8 and could see valuable minutes in his first year at Duke. The Blue Devils are also still recruiting four-star center Hunter Dickinson, although Williams' pick likely hurts their chances at Dicksinon.