The 2019 Toronto Defiant season was the first season of Toronto Defiant's existence in the Overwatch League as one of eight expansion franchises added for the 2019 season. After posting a 5–2 record in Stage 1, the Defiant qualified for the Stage 1 Playoffs, but a 0–3 loss against the Shock eliminated the team in the quarterfinals. The team failed to recreate the success they found in Stage 1 in the following stages, going 2–5, 0–7, and 1–6 in Stages 2, 3, and 4, respectively. A 2–3 loss to the Fusion on August 4 officially eliminated Toronto from postseason contention, and three days later, the team released head coach Lee "Bishop" Beom-joon. Despite numerous roster changes throughout the season, the Defiant finished the season in 17th place overall with an 8–20 record.