A native of Leawood, Kansas, Seth Sinovic walked on at Creighton University and became a team captain for the Blue Jays in 2008 and 2009 before being drafted by the New England Revolution in the 2010 MLS SuperDraft.
Sinovic was then signed by Sporting Kansas City in May 2011 after one season in New England. He scored his first professional goal in the 2012 MLS Cup Playoffs and registered the second of his career in the 2013 postseason as Sporting KC won MLS Cup. He has contributed prominently during his eight-year stint in Kansas City, starting 231 of 242 appearances in all competitions with four goals and 15 assists.
2019: MLS regular season: Has started seven of eight appearances and contributed to one shutout (693 minutes played). Concacaf Champions League: Started five matches and contributed to three shutouts (449 minutes played). Played the entirety of both shutout wins over Deportivo Toluca FC in the Round of 16 before starting in a 3-0 second-leg win over Independiente in the Quarterfinals on March 14. Open Cup: Has not featured. MLS Cup Playoffs: Has not featured.
2018: MLS regular season: Started 19 of 23 appearances, recorded two assists and contributed to nine shutouts (1,650 minutes played). Assisted Daniel Salloi's go-ahead goal in a 4-2 loss at Real Salt Lake on July 4. Assisted Diego Rubio's goal in a 2-0 win over Minnesota United FC on Aug. 25. Open Cup: Started and played 65 minutes in a 4-2 quarterfinal loss at the Houston Dynamo on July 18. MLS Cup Playoffs: Started three matches and contributed to one shutout (270 minutes played). Started and played 90 minutes in a 4-2 conference semifinal second-leg win over Real Salt Lake on Nov. 11. Started and played 90 minutes in a 0-0 conference championship first-leg draw at Portland on Nov. 25. Started and played 90 minutes in a 3-2 conference championship second-leg loss to Portland on Nov. 29.
2017: Was named the Neal and Jeanne Patterson Humanitarian of the Year for his charitable work with The Victory Project and other philanthropic causes. MLS regular season: Made 32 starts, contributed to nine shutouts, and recorded one goal and two assists (2857 minutes played). Enjoyed a career game in a 3-1 win over the Colorado Rapids on April 9, scoring his first career regular season goal in his 158th MLS appearance before assisting Dom Dwyer's late strike. Assisted Diego Rubio's game-winning goal in a 2-1 victory over the LA Galaxy on Sept. 24. Open Cup: Started and played 90 minutes in a 4-0 fourth-round win over Minnesota United FC on June 14. Started and played 90 minutes in a 2-0 round of 16 win over Houston Dynamo on June 28. Started and played 15 minutes against FC Dallas on July 11. Started and played 90 minutes in a 2-1 Open Cup Final victory over the New York Red Bulls on Sept. 20. MLS Cup Playoffs: Did not feature.
2016: Started eight of 12 appearances in all competitions, recording one goal and one assist (772 minutes played). MLS regular season: Started six of nine appearances, contributing to three shutouts (532 minutes played). Made his season debut as a second-half substitute at FC Dallas on April 17 and earned his first start in a 1-1 draw against LA Galaxy on May 1. Open Cup: Did not feature. CONCACAF Champions League: Started and played 66 minutes in a 2-2 draw at Central FC on Aug. 16, scoring his third career goal for the club in the 51st minute. Played 61 minutes in a 2-1 loss to Vancouver on Sept. 13, assisting Diego Rubio's goal in the 55th minute. MLS Cup Playoffs: Started and played 89 minutes in a 1-0 knockout round loss at Seattle Sounders FC on Oct. 27.
2015: MLS regular season: Started 10 of 11 appearances and contributed to three clean sheets (902 minutes played). Returned to the lineup on Aug. 29 after missing more than three months with a concussion. MLS Cup Playoffs: Did not feature. Open Cup: Started and played 78 minutes in a championship win over the Philadelphia Union on Sept. 30 as Sporting KC prevailed 7-6 in penalty kicks after a 1-1 draw in regulation.
2014: Was named Sporting KC's 2014 Defender of the Year. MLS regular season: Appeared in 31 matches, all starts, and contributed to nine shutouts with two assists. Earned his first assist of the season on Lawrence Olum's goal in a 1-0 win over the Portland Timbers on June 27. Earned MLS Team of the Week honors (Week 23) after a 4-1 win over Toronto FC on Aug. 16. Assisted Dom Dwyer's goal in a 2-1 loss at New York on Sept. 6. MLS Playoffs: Played 90 minutes in a 2-1 loss at New York in the Eastern Conference Knockout Round (Oct. 30). CCL: Played 90 minutes in the 2013-14 CONCACAF Champions League first leg against Cruz Azul, contributing to a 1-0 shutout win. Started four matches (360 minutes) in the 2014-15 group stage, contributing to one shutout. Assisted Claudio Bieler's opening goal in a 3-0 win over Real Esteli on Sept. 23. Open Cup: Played 90 minutes in a 2-0 fourth round win over Minnesota United FC on June 18. Played 90 minutes in a 3-1 fifth round loss to Portland on June 24. Friendly: Played 45 minutes in a 4-1 Champions Shield defeat to Manchester City on July 23 at Sporting Park.
2013: MLS: Set career-high in games played (32), games started (31) and minutes (2,773). Tallied three assists, all game-winners. Assisted on Aurelien Collin's goal at Houston on May 12, Graham Zusi's goal at Chicago on July 7 and Soony Saad's goal vs. Toronto FC on July 23. Playoffs: Started and played full-time in all five MLS Cup Playoff matches. Scored the game-tying goal in the second leg of the Conference Semifinal series vs. New England. Converted his penalty kick in the MLS Cup Final shootout vs. Real Salt Lake. CCL: Started all four of Sporting KC's 2013-14 CONCACAF Champions League group stage matches. Open Cup: Played 90 minutes in a 1-0 loss to Orlando City SC on June 12.