Hold your breath, Suns fans ... Kevin Durant injured his ankle during pregame warmups on Wednesday night -- and now, there's fear the ailment could keep him out of the rest of the regular season.
The new Phoenix superstar was getting in some shots before what was supposed to be his first-ever home game as a Sun against the Thunder at Footprint Center ... when his left leg buckled.
You can see in video of the play, Durant's ankle folded on itself ... sending the 34-year-old crashing to the hardwood in pain.