Salt Lake beats Sounders to go top
Real went top of the Western Conference and the Supporters' Shield standings on 30 points thanks to Beckerman (41) and Findley (46).
The win stretched Real's unbeaten game to five while the Sounders lost for the second time in 10.
Federico Higuain opened the scoring from the spot in the seventh minute, but Duka (52) and Magee (54) turned the match around.
Kei Kamara opened the scoring from the penalty spot two minutes from the break and JeVaughn Watson's own goal in the 58th minute stretched the gap.
The turning point came when CJ Sapong saw red in the 68th minute, and Dallas took advantage as Jackson (88) and Walker Zimmerman (90) netted late on.