Bagley, who was part of the younger Select Team at the national team camp in Las Vegas, was a contender to make the final 12-man squad after surviving the first round of cuts announced on Saturday.
With Bagley bowing out, Team USA head coach Gregg Popovich will need to cut four more players.
Remaining players with Team USA
|Harrison Barnes||F||Sacramento Kings|
|Jaylen Brown||G/F||Boston Celtics|
|De'Aaron Fox||G||Sacramento Kings|
|Joe Harris||G||Brooklyn Nets|
|Kyle Kuzma||F||Los Angeles Lakers|
|Brook Lopez||C||Milwaukee Bucks|
|Kyle Lowry||G||Toronto Raptors|
|Khris Middleton||G/F||Milwaukee Bucks|
|Donovan Mitchell||G||Utah Jazz|
|Mason Plumlee||C||Denver Nuggets|
|Marcus Smart||G||Boston Celtics|
|Jayson Tatum||F||Boston Celtics|
|P.J. Tucker||F||Houston Rockets|
|Myles Turner||C||Indiana Pacers|
|Kemba Walker||G||Boston Celtics|
|Derrick White||G||San Antonio Spurs|
Bagley will now prepare for his sophomore NBA season. The Duke product was the second overall pick in 2018, and he averaged 14.9 points, 7.6 rebounds, and one assist per game in his rookie campaign.
USA Basketball, meanwhile, will resume its summer camp on Tuesday at the Los Angeles Lakers' practice facility, where the team will remain through Thursday before heading to Anaheim, Calif. to host the Spanish national team in a World Cup tune-up on Friday.
Team USA will then fly out to Australia for two weeks before arriving in China ahead of their first World Cup contest against the Czech Republic on Sept. 1.