Kenny Cooper and Lamar Neagle scored for Seattle, which got two assists from Obafemi Martins.
Kenny Cooper didn't wait long to punish his former club.
The Seattle Sounders forward scored the last-gasp winner two minutes after coming off the bench as his side came from behind for a 2-1 victory over FC Dallas on Wednesday. Seattle (7-2-1) also got a goal from Lamar Neagle and two assists from Obafemi Martins, while Dallas (5-4-1) saw Michel convert from the spot.
Dallas took the lead in the 16th minute. Makeshift Seattle left back Brad Evans was called for a penalty kick when he tangled legs with Dallas striker Blas Perez, and Michel slotted his shot past a frozen Stefan Frei.
Seattle drew even in the 62nd minute, with Neagle making a near-post run and steering home Martins' cross for his third goal in four games.
The Sounders nearly took the lead minutes later, but Fernandez tipped a long-range Osvaldo Alonso shot off the post and then acrobatically denied Clint Dempsey's stab at the rebound.
But Seattle got the winner in the 88th minute when Martins raced down the left flank and found Cooper, who converted from close range.
The Sounders have now won five straight, while Dallas has lost three in a row.