Reign Academy and Crossfire Premier are selected as two of the 25 founding members of the U.S. Soccer Girls’ Development Academy. They will begin play in the fall of 2017 in age groups for U14/U15, U16/U17, and U18/U19.

Justin Stoddard, a 19-year-old rookie from Port Orchard, becomes the first teenager to score an A-League goal for the Sounders in a 2-0 win at New Orleans. Stoddard, a starter in eight of the first 10 games, earned his first assist on Chugger Adairs late winner at Nashville May 16.

Seattle Sounders U23s cannot parlay home-field advantage into a PDL title, falling to Ontario's Kitchener-Waterloo United, 1-0, at Starfire Stadium. K-W United score off Julian Buescher's free kick in stoppage time. The Canadians had three other chances hit the crossbar, post and get cleared off the line. K-W United proceed to win the championship the following day, 4-3, over New York Red Bulls U23s.

Behind Emmett Minaglia’s five goals, Seattle defeats Portland all-stars, 5-3, at Civic Stadium. Seattle’s team is picked from Montag Vikings and Westerman Clothiers, the top teams in the state first division.

Joan Dunlap of Seattle is voted MVP of the Tar Heel Invitational after No. 1 North Carolina wins three times in two days. In a big game vs. No. 8 Central Florida, Dunlap scores twice in 3 minutes of the 3-1 win while Michelle Akers tallies for the Knights.

Lamar Neagle scores his first-career MLS goal and Patrick Ianni adds another, giving the Sounders a 2-1 victory over a 10-man Real Salt Lake at Rio Tinto Stadium. Ianni ends Salt Lake's 409-minute shutout streak at 71', and Neagle rips a rising drive past Nick Rimando in the 84th. RSL sees its MLS record 29-game home-unbeaten streak snapped while Seattle begins an 11-game unbeaten run (8-0-3) across all competitions.