SAN ANTONIO -- Kawhi Leonard scored 25 points and the San Antonio Spurs dismantled the ailing Cleveland Cavaliers 103-74 on Monday night in a showdown that turned into a major letdown for the defending NBA champions.
LaMarcus Aldridge and Pau Gasol added 14 points apiece for the Spurs, who won their fifth straight.
Cleveland (47-26) dropped its second in a row, set a season low for points and fell a half-game behind Boston (48-26) for the top seed in the Eastern Conference playoffs.
Cavaliers star LeBron James was injured late in the third quarter after taking an elbow to the base of his neck. He remained on the bench for a while receiving medical attention, then headed toward the locker room and didn't return to the game.
His status was not immediately known.
Cleveland has been out of sync recently, losing three of five, and those struggles only got worse against San Antonio. The Spurs led by as many as 33 points to the delight of the sold-out crowd.
San Antonio (57-16) is two games behind Golden State (59-14) for the league's best record entering a home showdown with the Warriors on Wednesday.
Cleveland opted to play its stars rather than sit them for rest, but the trio of James, Kyrie Irving and Kevin Love sat out the fourth quarter of its second rout in the past two weeks.
James exited with 25 seconds remaining in the third after taking an elbow to his neck from David Lee on a rebound. James continually rubbed the area before collapsing after he crossed midcourt and remained on the floor for about a minute before walking unassisted to the bench. He left for the locker room early in the fourth quarter during a timeout.
James finished with 17 points, eight rebounds and eight assists in 29 minutes.
The Spurs held the Cavaliers scoreless for three minutes after San Antonio coach Gregg Popovich was issued a technical foul during a timeout with 6:38 remaining in the first half.
Leonard hit a right-handed runner as the second quarter closed to give the Spurs a 64-40 lead.
Cavaliers: Cleveland completed its schedule against the West, finishing 16-14. In addition to losing to the Spurs by 29 points, the Cavaliers lost by 35 to Golden State and 30 to the Los Angeles Clippers. . Cleveland F Kyle Korver missed his third straight game with a sore left foot, and the team plans to sit him for several games to see if rest and treatment helps. Korver will sit out Thursday in Chicago and Friday at home against Philadelphia before being re-evaluated, a team spokesman said. The shooting specialist missed seven games earlier this month with an inflamed tendon in his foot. . G Iman Shumpert missed his second consecutive game with a sore right knee. . James needs 24 points to pass Shaquille O'Neal for seventh overall in career scoring. O'Neal has 28,596 career points. . The Cavaliers averaged 116.3 points in their previous four games.
Spurs: San Antonio is holding its opponents to an average of less than 100 points for the 22nd straight season. . Danny Green tied his season high with four blocked shots. . Leonard has scored in double figures in 100 straight games.
Cavaliers: At the Chicago Bulls on Thursday night.
Spurs: Host the Golden State Warriors on Wednesday night.