On the only NBA court in which he hadn’t won, James was 0-5 here heading into the game. He completed his triple-double with a rebound with 2.8 seconds to play.
Mo Williams added 30 for Cleveland, including 6-of-10 3-pointers.
Matt Barnes scored 21 and Steve Nash 20 as the Suns extended their losing streak to six games, their longest in six seasons.
Phoenix is six games behind Dallas in the race for the final playoff berth in the West.
The Cavaliers made a season-best 17 3 pointers to win for the eighth time in nine games and improve to 13-2 since Jan. 30. It also set a new franchise record for road wins, surpassing the 22 they had in 1991-1992.
Cleveland took control of the intense contest with a late 10-2 run after the was cut to 101-100 with 7:04 remaining.
Williams hit a running 7-footer and a 3-pointer and James sank a 20-footer in the surge. James capped it with two free throws that made it 111-102 with 3:45 left. Nash’s 3-pointer cut it to 113-109 with 2:11 remaining, but Williams sank another 3, James added two free throws, and the Suns were finished.
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