Atlanta Braves star outfielder Ronald Acuña Jr. will miss the rest of the season after he tore the anterior cruciate ligament in his left knee during Sunday's 8-1 victory at Pittsburgh.

The reigning NL MVP led off the game with a double to right-center field off Martin Perez. With Marcell Ozuna at the plate, Acuña started toward third on a stolen base attempt and his left knee gave way. Acuña remained down for several minutes while being treated, pointing at his left leg before walking off under his own power.

The Braves' initial diagnosis was left knee soreness. But the team announced Sunday night that an MRI showed a complete ACL tear that will require season-ending surgery.

Acuña tore his right ACL on July 20, 2021. Wearing a brace in the clubhouse after Sunday's win, the 26-year-old outfielder said this injury felt less severe.

"(I) don't feel that painful, any pop or anything. ... Don't think it's that bad," Acuña said.

Acuña said he was looking to take third when he anticipated a slow throw back to the mound from catcher Joey Bart. The toss came in harder than expected, leading to an abrupt pivot back to second with his knee twisting.

Acuña is batting .250 with four homers and 15 RBIs in 49 games. The four-time All-Star hit a career-best .337 last season with 41 homers and 106 RBIs.

Atlanta already was missing All-Star right-hander Spencer Strider, whose season ended on April 13 when he had internal brace surgery to repair the ulnar collateral ligament in his pitching elbow. Third baseman Austin Riley is day to day with a left intercostal strain, and catcher Sean Murphy remains on the 10-day injured list with an oblique injury after he got hurt on opening day.

The Associated Press contributed to this report.