2020 (Philadelphia): Wagner has made 14 appearances (14 starts) for the Union at leftback, scoring one goal and adding two assists ... Helped the Union secure a 1-0 victory over NYCFC (July 9), the first shutout of the season ... Netted his first goal of the season in the 5th minute of the Union’s 2-1 victory over Inter Miami (July 14) ... Helped secure a clean sheet in the 1-0 victory over New England Revolution (July 25) to send the Union to the MLS is Back Quarterfinals...Added a pair of assists in the Union's 5-0 home victory over Toronto FC (October 24).
2019 (Philadelphia): Wagner has made 30 appearances (30 starts) for the Union this season at leftback, totaling eight assists ... made his team debut with a start in the season opener vs. Toronto (March 2) ... notched his first assist as the member of the Union on Brenden Aaronson's goal at Atlanta (March 17) ... assisted on Alejandro Bedoya's goal vs. Montreal (April 20) ... missed the matches at Vancouver (April 27) and vs. Cincinnati (May 1) through red-card suspension and subsequent supplemental discipline ... returned to the lineup vs. New England (May 4) and contributed an assist in the 6-1 win ... recorded his fourth assist of the season with a secondary helper on Kacper Przybylko's goal vs. Portland (May 25) ... tied an all-time Union record with five blocked shots in one match during the 3-2 win at Minnesota (June 2) ... missed the match at Real Salt Lake (July 13) with a quad injury ... returned to the lineup and notched his fifth assist of the season on Marco Fabian's set piece goal vs. Chicago (July 20); was named to the MLS Team of the Week (Week 20) for his efforts ... served a one-match suspension for yellow-card accumulation at Montreal (July 27) ... contributed his sixth assist of the season with a game-winning helper on Marco Fabian's first goal at D.C. United (August 4) ... tallied assist number seven with a helper on the opening goal vs. D.C. United (August 24) ... tied Sheanon Williams' all-time single-season club record with his eighth assist as a defender, helping set up the game-winning goal vs. Atlanta (August 31).
2018-19 (Philadelphia/Würzburger Kickers): Wagner joined the Union for an undisclosed transfer fee during Philadelphia's preseason. Prior to the move, he had totaled two assists in 13 games for Würzburger.
2017-18 (Würzburger Kickers): In his first season with Würzburger Kickers, Wagner made 27 league appearances, registering one assist, vs. Hallescher FC (April 14).
2016-17 (FC Schalke 04 II): Wagner spent one season with FC Schalke 04, playing for the club’s reserves. He notched one assist across 33 appearances.
2015-16 (SSV Ulm 1846): In his first full senior professional season, Wagner notched one goal and seven assists for Ulm across 32 appearances.
ACQUIRED: Philadelphia Union sign defender Kai Wagner in exchange for an undisclosed transfer fee on February 6, 2019.