Less than a week ago, Joakim Noah was referring to Bulls teammate Nate Robinson as the ‘‘little warrior.’’

That was after the Bulls’ upset of the Heat in Miami, when the 5-9 point guard scored 27 points to open the Eastern Conference semifinals.

Since then, the defending NBA champion Heat has had Robinson coming up very small.

He had 11 points and four turnovers in Game 2, shooting just 3-for-10 from the field. In Game 3, he scored 17 points on 5-for-13 shooting and had three turnovers.

But no one saw his struggles in Game 4 coming.

In what Robinson called “the worst game of my life,’’ he went scoreless Monday, shooting 0-for-12 with four turnovers in one of the worst playoff losses in Bulls history.

So how has Robinson gone from a player ready to be handed the key to the city for his heroics in the first round against the Brooklyn Nets and Game 1 against the Heat to a player who’s 8-for-35 (23 percent) with 11 turnovers the last three games?

Credit Heat coach Erik Spoelstra with the adjustment.

Point guards Mario Chalmers and Norris Cole are putting more pressure on the ball when Robinson has it, and Spoelstra is also using whichever big is guarding the high pick-and-roll to double-team Robinson and take advantage of his trouble passing over bigger defenders.

‘‘He’s a tough guy to trap,’’ Spoelstra said. ‘‘He is like a whirling toy out there. And just because you think you know where he’s going to go, he doesn’t always go there. We finally had some timely traps and were able to force turnovers, but we know they have counters for that and we’ll need to be ready.’’

Better spacing could be one quick remedy for the traps. Robinson needs to stay away from the sidelines so that he has an escape route.

‘‘I’ve just got to beat the double-team before it gets to me,’’ he said. ‘‘Just quick movement. It can’t be me making the pass — it has to be one of the bigs. We’ll make adjustments.’’