The Seattle Sounders’ home match against the Vancouver Whitecaps on Wednesday (7:30 p.m. PT; JOEtv, ROOT Sports outside Seattle, KIRO Radio 97.3 FM, El Rey 1360 AM | TICKETS) is arguably the biggest game of the season to date. Seattle enters just four points behind the Western Conference-leading Whitecaps as the regular season winds down.

With that in mind, here is what’s at stake on Wednesday:

PLAYOFF POSITIONING

While the Sounders cannot technically advance higher than fourth because of a would-be three-way tie for second place, there is the potential for a massive six-point swing.