Three days after winning the MLS Cup, Evans was selected by Seattle Sounders FC with the tenth pick in the Expansion Draft, later being reunited with coach Sigi Schmid.
He started the first match in club history on March 19, a 3–0 win over the New York Red Bulls as he scored the second goal in the 24th minute from a Fredy Montero pass, finishing between the legs of New York goalkeeper Danny Cepero to begin the 2009 season.
Evans became a regular starter for the first-year Sounders, starting 27 of his 29 MLS appearances and scored two more goals, against San Jose in April and FC Dallas in October, to finish as the team's 4th top goalscorer, behind Montero, Nate Jaqua, and Steve Zakuani.
Evans played in the last 12 minutes of the U.S. Open Cup Final as the Sounders won their first trophy by defeating a 10-man D.C. United 2–1 on September 2.
He also played in both playoff matches as the Sounders lost 1–0 on aggregate to the Houston Dynamo in the Conference Semifinal.

Evans began the 2010 season by scoring in a 2–0 win over the expansion team Philadelphia Union in the 12th minute from a pass from Steve Zakuani.
Evans would not score for the rest of the season in MLS play, but assisted on Michael Fucito's goal in a 1–0 over the Kansas City Wizards in April via a throw-in and on Steve Zakuani's goal in a 3–0 win over the New England Revolution.
After a 3–2 loss to D.C. United in June, Evans suffered a knee injury and was forced to not play until the next season.
The midfielder returned for the 2011 season and played 71 minutes in a 1–1 draw with the Houston Dynamo in late March, missing the first 2 matches of the season.
He earned "Team of the Week" honors for a two-goal and assist performance against Toronto FC on April 30.
He scored the following weekend in a 2–1 loss at D.C. United from a penalty earned by Fredy Montero, and he later scored in his first Champions League match, a 4–1 win over Comunicaciones in Group D on August 16.
Evans contributed his fourth league goal, his third from a penalty, in a 3–1 win at the Vancouver Whitecaps to clinch the Cascadia Cup.
Evans assisted an Álvaro Fernández goal against Chivas USA before playing both games of the MLS Cup playoffs, where the Sounders lost 3–2 on aggregate to Real Salt Lake.
Evans finished with a career-high 5 goals and 5 assists in all competitions and ranked 3rd in both goals and assists in MLS play.

Evans began the 2012 season by scoring in the Champions League Quarterfinals in a 2–1 win over Santos Laguna, later losing 7–3 on aggregate and being eliminated from the tournament.
He was initially named a secondary captain behind Mauro Rosales, but declined in favor of giving the vice-captaincy to Fredy Montero.
Evans started the first two matches of the MLS season in March and scored in a 2–0 win over Houston from a penalty before injuring his hamstring and missing the next match, a 1–0 loss to San Jose.
The midfielder scored a goal in a 4–1 Open Cup semifinal victory over Chivas USA and provided an assist in a 2–2 draw with New York in July; as well as recording an assist in a 2–0 win over the Vancouver Whitecaps, and a goal in a 6–2 win over Chivas USA in August.
He also scored the game-winning goal in a 3–2 win over Marathón in September to qualify for the quarterfinals of the Champions League.
Evans earned his first "Player of the Week" award for playing as a defender after Zach Scott's red card 30 minutes into an eventual 0–0 draw with Real Salt Lake and 2 goals in a 3–1 win over Dallas.
He played 90 minutes in all 4 MLS Cup Playoff matches as the Sounders advanced to the Conference Final for the first time in franchise history, but lost 3–2 on aggregate to eventual champions Los Angeles Galaxy.
The midfielder played for the Sounders in 29 MLS matches and totaled 4 goals and 4 assists, with 39 appearances and 6 goals in all competitions.

At the end of the 2017 season Evans became a free agent
Three days after winning the MLS Cup, Evans was selected by Seattle Sounders FC with the tenth pick in the Expansion Draft, later being reunited with coach Sigi Schmid. He started the first match in club history on March 19, a 3–0 win over the New York Red Bulls as he scored the second goal in the 24th minute from a Fredy Montero pass, finishing between the legs of New York goalkeeper Danny Cepero to begin the 2009 season. Evans became a regular starter for the first-year Sounders, starting 27 of his 29 MLS appearances and scored two more goals, against San Jose in April and FC Dallas in October, to finish as the team's 4th top goalscorer, behind Montero, Nate Jaqua, and Steve Zakuani. Evans played in the last 12 minutes of the U.S. Open Cup Final as the Sounders won their first trophy by defeating a 10-man D.C. United 2–1 on September 2. He also played in both playoff matches as the Sounders lost 1–0 on aggregate to the Houston Dynamo in the Conference Semifinal.
Evans began the 2010 season by scoring in a 2–0 win over the expansion team Philadelphia Union in the 12th minute from a pass from Steve Zakuani. Evans would not score for the rest of the season in MLS play, but assisted on Michael Fucito's goal in a 1–0 over the Kansas City Wizards in April via a throw-in and on Steve Zakuani's goal in a 3–0 win over the New England Revolution. After a 3–2 loss to D.C. United in June, Evans suffered a knee injury and was forced to not play until the next season. The midfielder returned for the 2011 season and played 71 minutes in a 1–1 draw with the Houston Dynamo in late March, missing the first 2 matches of the season. He earned "Team of the Week" honors for a two-goal and assist performance against Toronto FC on April 30. He scored the following weekend in a 2–1 loss at D.C. United from a penalty earned by Fredy Montero, and he later scored in his first Champions League match, a 4–1 win over Comunicaciones in Group D on August 16. Evans contributed his fourth league goal, his third from a penalty, in a 3–1 win at the Vancouver Whitecaps to clinch the Cascadia Cup. Evans assisted an Álvaro Fernández goal against Chivas USA before playing both games of the MLS Cup playoffs, where the Sounders lost 3–2 on aggregate to Real Salt Lake. Evans finished with a career-high 5 goals and 5 assists in all competitions and ranked 3rd in both goals and assists in MLS play.
Evans began the 2012 season by scoring in the Champions League Quarterfinals in a 2–1 win over Santos Laguna, later losing 7–3 on aggregate and being eliminated from the tournament. He was initially named a secondary captain behind Mauro Rosales, but declined in favor of giving the vice-captaincy to Fredy Montero. Evans started the first two matches of the MLS season in March and scored in a 2–0 win over Houston from a penalty before injuring his hamstring and missing the next match, a 1–0 loss to San Jose. The midfielder scored a goal in a 4–1 Open Cup semifinal victory over Chivas USA and provided an assist in a 2–2 draw with New York in July; as well as recording an assist in a 2–0 win over the Vancouver Whitecaps, and a goal in a 6–2 win over Chivas USA in August. He also scored the game-winning goal in a 3–2 win over Marathón in September to qualify for the quarterfinals of the Champions League. Evans earned his first "Player of the Week" award for playing as a defender after Zach Scott's red card 30 minutes into an eventual 0–0 draw with Real Salt Lake and 2 goals in a 3–1 win over Dallas. He played 90 minutes in all 4 MLS Cup Playoff matches as the Sounders advanced to the Conference Final for the first time in franchise history, but lost 3–2 on aggregate to eventual champions Los Angeles Galaxy. The midfielder played for the Sounders in 29 MLS matches and totaled 4 goals and 4 assists, with 39 appearances and 6 goals in all competitions.
At the end of the 2017 season Evans became a free agent
Brad Evans