Philadelphia Union defender Sheanon Williams is well aware just how important this weekend's MLS clash with DC United is.
The Union, placed sixth in the East, take on the Conference leaders in Washington on Saturday as they chase a spot in the 2014 play-offs.
Philadelphia have put together an unbeaten run of five matches under interim boss Jim Curtin and Williams is looking to extend that one further when they meet their regional rivals.
"With the amount of games we have left, there's really no margin for error," Williams said.
"Since Jim took over, all of our games have been big games, trying to climb back into the standings and put ourselves into position to potentially be in the playoffs.
"With DC, it being a rivalry game for us, it makes it a little bit bigger of a game."
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