In the final week of the regular season, New York head to The Novo in Los Angeles for the Kit Kat Rivalry Weekend, hosted by the Los Angeles Valiant. Their first match was against the Boston Uprising on August 24. While the Uprising were able to take a map in the match, New York came out with a 3–1 win. The team's final match of the regular season was against the Pacific Division Champions Vancouver Titans a day later. The two teams traded map wins throughout the match; after four maps the series was tied, forcing the match to a fifth map. Vancouver and New York both took a point in the final map, Lijiang Tower, but the Titans came out on top to hand NYXL 2–3 match loss. As the second seed in the season playoffs, New York began their playoff run with a match against the seventh-seeded London Spitfire on September 6. New York took the first map, Busan, to take a quick 1–0 lead in the series. For the second map, London selected Numbani. Both teams were able to complete the map on their respective attacks, but New York came out on top in overtime rounds to take a two-map lead. After a match break, the Spitfire selected Temple of Anubis for map three; again, both teams were able to complete the map on their first attacks. While London was able to take the first point on their second attack, New York's but up a solid defensive performance and prevented the Spitfire from completing the map a second time, leading to a third map win for the Excelsior. For map four, the match went to Watchpoint: Gibraltar. London took a win on the map to close the gap to 3–1. However, New York won in two rounds on Ilios to win the match in a 4–1 victory. Moving on the first round of the winners' bracket, NYXL next faced the sixth-seeded Atlanta Reign two days later. New York jumped to a quick lead, winning on Busan and King's Row in the first to matches, but Atlanta closed the gap after the match break, claiming a win on Hanamura. For map four, New York selected Rialto, and while the Reign nearly took that map to even the score, excellent defensive Bastion play by New York's Park "Saebyeolbe" Jong-ryeol ensured that the Reign would fall short. The Reign selected Lijiang Tower for map five and won it in two rounds, again closing the gap.