Mark Noble said the Hammers were on the end of one of the goals of the season as Wayne Rooney's double guided Manchester United to victory at the Boleyn Ground on Saturday night.
Rooney opened the scoring with a stunning 50-yard volley which caught goalkeeper Adrian out and West Ham midfielder Noble felt that moment of brilliance tipped the balance the visitors' way.
The England striker added a second in the opening period when Noble's attempted clearance cannoned off him and into the net but despite the final 2-0 scoreline, the No16 did not think there was too much between the sides.
He said: "I was standing behind it [Rooney's opener], to be honest. As soon as it came down and as soon as he hit it I said 'you've done him, it's in'.
"It looked in all the way and I think one of the boys said after that he only hit it because he thought it was a foul.
"You can't take anything away from him, though. It is probably the goal of the season and one of the best goals he has ever scored and he has scored some special ones.
"I don't think there was much in the game up until then and obviously for the second unfortunately the ball came in, I saw it late and I tried to clear it and it has hit him and gone in.
"It is was his day today but, to be honest, I don't think there was much in the game. I thought we had some chances but it didn't fall for us."
The defeat was the Hammers' third in a row, but Noble believes they can bounce back swiftly when they host Hull City on Wednesday.
He continued: "Obviously we've gone from an unbelievable run of wins on the bounce and now we've had three losses in a row.
"I think you'd agree with me that this is one of the freakiest seasons you've ever seen and the tightest.
"There are probably only two teams that aren't playing for anything, Newcastle and Southampton, and the rest of us are in a scrap, whether it is for the Europa League, Champions League or the fight to avoid relegation.
"It is going to be tough. We've still got eight games left and we've got to put some points on the board.
"Obviously it a big game on Wednesday. Hull beat West Brom on Saturday so they are going to have confidence, but we need to play like we can do at home."