The Sounders (6-1-1) have won four straight and are unbeaten in their last five (4-1-0) in the best start in the franchise's four-year history. Philadelphia (2-5-1) has lost two in a row.
Fredy Montero set up Rosales' first goal of the season with a pass through the penalty area toward the right side. Rosales ran onto it and beat goalkeeper Zac MacMath to the left corner from 10 yards.
Meredith got the start in place of Michael Gspurning, who went out at halftime Wednesday night because of a rip hip injury in a 2-0 home victory over Los Angeles. Meredith stepped in for the second half and preserved the shutout. Gspurning was listed as probable Saturday, but didn't suit up.
The shutout was the Sounders' second straight and sixth in the last seven games.
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