Kevin Durant withdrew Thursday from the U.S. national team, the biggest loss yet for a weakening American squad.
The NBA's MVP took part in the Americans' training camp in Las Vegas last week, but then informed team officials that he wasn't going to continue.
"Kevin reached out to Coach K and myself this afternoon and expressed that he is just physically and mentally drained from the NBA season and his attention to his many responsibilities,' USA Basketball chairman Jerry Colangelo said in a statement. "He tried to give it a go at our recent Las Vegas training camp but felt coming out of camp that he was not prepared to fulfill the commitment he made to the team."
Durant was the MVP of the world championship in 2010, leading the Americans to that title for the first time since 1994. The Oklahoma City star also started on their gold medal-winning team in the 2012 Olympics.
His withdrawal comes less than a week after Indiana's Paul George was lost to a broken right leg and follows previous withdrawals by All-Stars Kevin Love, Blake Griffin and LaMarcus Aldridge, and NBA Finals MVP Kawhi Leonard.
"This was an extremely difficult decision as I take great pride in representing our country," Durant said. "I know that I owe it to my USA Basketball teammates to be totally invested in the experience. After going through training camp with USAB, I realized I could not fulfill my responsibilities to the team from both a time and energy standpoint.
"I need to take a step back and take some time away, both mentally and physically in order to prepare for the upcoming NBA season. I will be rooting for USAB and look forward to future opportunities with them."