Now that the Seattle Sounders are the 2nd worst team - yes, that is true - they are in a situation where they need a winning streak. Most teams in MLS have a three-game win streak in them during a year. Columbus, Red Bulls, Orlando, Philly, Portland, and Toronto all have three-match, or more, winning streaks in 2017.
In 2016 Colorado, Dallas, D.C., LA, Montreal, New England, RBNY, NYCFC, RSL, Seattle, KC and Vancouver all did the same. In 2015 sixteen teams had three-game winning streaks. It’s common, even for a bad team in MLS, to win three in a row.