Two controversial Mark Noble penalties saw West Ham beat wasteful Nottingham Forest to go top of the Championship for the first time this season.
Forest had the better of the first half with Marcus Tudgay, Lewis McGugan and Paul Anderson all missing good chances.
But Noble blasted in the opener in first-half injury time after Guy Moussi was penalised for handball and made it 2-0 following Chris Gunter's handball.
McGugan did find the net with a fine 20-yard strike but the Hammers held on.
McGugan's injury-time effort - just Forest's fourth goal in their last 12 games - came too late to threaten the home side's lead and lift the gloom at the City Ground.
Steve Cotterill's Forest side remain in the relegation zone, four points from safety.
But although they will feel unfortunate to be on the wrong end of two tough penalty calls, the Reds should have been at least two goals up by the time referee Tony Bates award a spot-kick when Moussi blocked Sam Baldock's cross with his hand.
Tudgay twice fired over over and McGugan also failed to find the target when well placed.
However their best opening saw Anderson shoot tamely at goal after great work by Marlon Harewood and McGugan.
Kevin Nolan and George McCartney both had half-chances before the Hammers went ahead, despite Lee Camp getting a hand to Noble's strike.
The visitors continued to have the upper hand after the interval with home goalkeeper Robert Green denying Gunter and a McGugan cross coming back off the post and then being smashed off the line by Noble.
At the other end Jack Collison could have doubled the lead after a fine run and Camp made a fine diving save to keep out a Henri Lansbury effort.
But Noble did add a second soon after the hour, and West Ham were able to enjoy going top despite McGugan's last-gasp strike.