Walsall manager Dean Smith thought his side were denied a late penalty as they slipped to a 2-1 defeat by Leyton Orient.
Striker Will Grigg appeared to be fouled in the box but nothing was given and hard-working Orient held on for their second away win of the season.
Smith said: "I thought we should have had a second penalty and a chance to make it 2-2, but I'm proud of my players for their attitude and application.
"The disappointing thing was that we didn't work their keeper enough in the first half when I thought we controlled the game."
Orient scored two stunning goals in the first half, Lee Cook hammering a left-foot drive over keeper Karl Darlow in the 11th minute, and Dean Cox blasting home a second after 29 minutes with an amazing shot from the halfway line.
Grigg scored his first goal of the season from the spot in the 58th minute after Gary Sawyer tripped Ben Purkiss, sparking a fierce Walsall fightback which saw skipper Andy Butler hit a post and a low drive by Andy Taylor well saved by Ryan Allsop.
Orient manager Russell Slade was delighted with the result which lifted his side into the top half of the League One table.
He said: "We won deservedly so on reflection of the 90 minutes. In the first half I thought we were excellent, and the only disappointing thing about the first half was that we were only two up because we had good chances to make it three or four."
Asked about Walsall's late penalty shout, Slade said: "I thought we could have had a penalty in the second half when we had a player brought down. I think it would have been a travesty if we hadn't won the game.
"Fair play to Walsall, they put us under a lot of pressure in the second half but there were not too many saves my goalkeeper had to make."