Zion Williamson and RJ Barrett have yet to step on an NBA court — but they’re already shattering records when it comes to moving merch.

The dynamic Duke roommates — who got picked No. 1 and No. 3, respectively, in last week’s draft — sold more jerseys and shirts than any other draftees in history, according to Fanatics, the sports-licensing firm that operates the NBA’s online store as well as its brick-and-mortar flagship on Fifth Avenue.

Williamson, the 6-foot-7, 285-pound power forward who took college basketball by storm in his one-and-done season, was snapped up by the New Orleans Pelicans last Thursday. During the next five days, he sold more $110 Nike jerseys and $32 T-shirts than all the first-round picks in the 2018 NBA Draft combined, according to Fanatics.

Meanwhile, top New York Knicks pick Barrett, despite trailing Williamson, has sold twice as much merchandise as Lonzo Ball, who had set the previous record for NBA Draft merch sales after becoming the Lakers’ No. 2 draft pick in 2017, Fanatics said.

Both players have had big followings on social media since grade school, when highlight videos of their early promise began to circulate, industry experts note.

They are “both likeable, well-spoken athletes who don’t have any baggage,” sports marketing consultant Joe Favorito said of the former Blue Devils teammates, who are also best friends.

The hype for Williamson’s NBA arrival has often been compared to that for superstar LeBron James when he was drafted in 2003. But it’s not clear whether his marketing muscle will surpass King James’.

“At the end of the day, how he and RJ play in the NBA will determine their ultimate value,” Favorito said.

Williamson’s fame grew in February when his Nike shoe exploded during a game against the North Carolina Tar Heels.

Former President Barack Obama, sitting courtside at the game, was caught on camera mouthing the words “his shoe broke.”

Williamson left the game with a knee sprain and missed five more games because of it.

Nike lost about $1.1 billion in market capitalization when its stock price dipped by more than 1% after the incident.