Spurs forward Matt Bonner was sitting in his locker at Oracle Arena before Monday’s 116-106 loss at Golden State, fiddling with a video game on his iPhone, when an assistant coach ambled up to deliver the bad news.

Bonner would be earning his first career start at small forward.

Not exactly the fleetest of foot on the Spurs’ roster, Bonner at first thought he was being pranked.

“You guys suck,” Bonner said finally, with mock indignation. “You’re just trying to embarrass me.”

Welcome to end-of-the-season basketball in the NBA, which can often look suspiciously like preseason basketball in the NBA.

With the No. 2 seed in the Western Conference playoffs already locked up, coach Gregg Popovich took the opportunity to sit Tim Duncan, Tony Parker and Kawhi Leonard on the second night of a back-to-back.

With Manu Ginobili and Boris Diaw already back home nursing injuries, and recently released Stephen Jackson getting a head start on an early vacation, it left the Spurs with nine active players to face a Warriors team still scrambling for playoff positioning.

Stephen Curry pumped in 35 points and closed in on the NBA’s single-season 3-point mark, Klay Thompson chipped in 23 points, and the Warriors beat back the short-handed but scrappy Spurs, who were within 88-87 with 9:29 to go.

The fairy tale ended there for the Spurs. Golden State scored the next 19 points to break the game open.

The victory, combined with Houston’s loss in Phoenix, vaulted Golden State (46-35) back to sixth in the West with a game to play — and, for now, out of a first-round meeting with the Spurs.

If the playoffs began today, the Spurs (58-23) would face the Rockets in the first round, but the Warriors and even Los Angeles Lakers remain possibilities. The likeliest scenario has the Spurs facing the winner of Wednesday’s Lakers-Rockets finale.

The Spurs close the regular-season at home Wednesday against Minnesota, with a game Popovich indicated would feature more star-power from his team than Monday’s.

“Everybody will play, because it’s not a back-to-back,” he said.

Before Monday’s game, Popovich groused about the way his struggling team, 6-6 in its previous 12 games and without a road win since the end of the rodeo trip in February, was lurching toward the playoffs.