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After the 2016-2017 season, the Penguins traded Sundqvist and their first-round pick to the St. Louis Blues for right wing Ryan Reaves and a second-round pick. Sundqvist saw a new career high 42 games in 2017-2018 with 1 goal, 4 assists, 5 points, and a -5. Fans kind of wondered why the Blues even traded for him. People seemed to want him traded. People forgot he was still young and had potential to be a good player if he got the chance. That's what happened finally in 2018-2019. Sundqvist played a career high 74 games with 14 goals, 17 assists, 31 points, and a -1. All of those were career highs for Sundqvist.
Sundqvist helped the Blues win their first ever Stanley Cup in franchise history. During the postseason run, Sundqvist played in 25 games with 4 goals, 5 assists, 9 points, and a plus 5. Sundqvist has become a great penalty killer for the Blues.
Overall, Sundqvist has played 4 seasons in the NHL. Sundqvist has played 144 games with 16 goals, 24 assists, 40 points, and a -10. In the playoffs, Sundqvist has played 27 games with 4 goals, 5 assists, 9 points, and a plus 5.
The Blues kept Sundqvist at a great price. Hopefully, Sundqvist can continue to have the success he had in the 2018-2019 season.