Luka Doncic puts 48 on the board for Slovenia.

Luka Doncic of Slovenia, left, scored past Patricio Garino of Argentina during a men’s basketball preliminary game on Monday.Credit...Pool photo by Aris MessinisSAITAMA, Japan — Luka Doncic made his Olympic debut for Slovenia on Monday. He also made sure it was memorable.

Doncic, a two-time N.B.A. All-Star with the Dallas Mavericks, erupted for 48 points as Slovenia blew past Argentina, 118-100, in the first game of men’s basketball group play for both teams.

“He just destroyed us,” said Sergio Hernandez, the Argentina coach.

Doncic’s scoring binge tied him for the second most points ever in a game at the Olympics (Ed Palubinskas scored 48 points for Australia in 1976), and he probably would…