It was a case of deja vu for the Oklahoma City Thunder on Sunday night as they once again suffered a collapse late in the fourth quarter to lose.Throughout the season, they've struggled to win games down the stretch when the score is close in the final five minutes and that proved to be the case against the Portland Trail Blazers in a thrilling encounter.Both teams went back and forth in the final minute as they traded buckets but it was the visiting Blazers who eventually came away with the victory as OKC were the architects of their own downfall.Just like the defeat to the Boston Celtics last week, Carmelo Anthony had another meltdown in the final period.After missing back-to-back wide-open threes against the Trail Blazers, the veteran then committed a costly turnover and missed a potential game-tying three-pointer with a good look at the buzzer."I had two previous to that shot, two open looks, shots that I would take at any moment, on any night," Anthony said, per ESPN's Royce Young."To get those three looks that I got, two back-to-back, then one to send the game to overtime, can't ask for any better looks than that.It compounds a tough week for Melo after he inconceivably missed two free-throws that allowed the Celtics to hit a game-winner in another agonising defeat."When you look back at it, I think when you look at it as a whole, you see the Boston game, then tonight missing three threes down the stretch, as an individual that's made those shots before, it's tough to look at, and you always question yourself of what happened or didn't happen, but you can't beat yourself up about it."Anthony finished the game 3-of-13 from the field and 0-of-5 from beyond the arc as the Thunder missed a chance to close the gap on the third-placed Blazers.Speaking after the game, head coach Billy Donovan didn't regret his decision to bring the 10-time All-Star back on the floor late in the game despite his horrible shooting night.

He replaced Jerami Grant for the final seven minutes - who had 17 points in 19 minutes off the bench and was playing well on both ends.

"Listen, Carmelo didn't shoot the ball particularly well, but he's shot the ball well his whole entire career. I felt really good about the shots that he got," Donovan said.

"Carmelo is a proven scorer in this league and has made shots, big shots, for a large portion of his career, and I've got confidence in him. So we're going to go with him in that situation. That's just how I felt."

Since joining OKC, it has been a difficult transition for Carmelo as he's the third scoring option on the team and is often asked to spread the floor and be a shooter to complement Westbrook and Paul George.

He's averaging a career-low 16.5 points per game on a career-low 40.3 percent shooting.

Donovan will certainly have to make big decisions involving Anthony moving forward as his contributions haven't been that big in recent months.

There's no doubt he's still a talented scorer but he has hurt the team defensively and on nights when he can't get it going on offence, he makes little impact on the court.

This is a problem the Thunder coaching staff will have to deal with soon before it hurts them in the playoffs.

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