Belak played in 63 games with Toronto during the 2001–02 season, scoring a goal and four points, while recording 142 PIM, which was second to Tie Domi on the team. Belak made his playoff debut on April 18, 2002, getting no points in a 3–1 win over the New York Islanders. He scored his first playoff goal and point on April 28, 2002, scoring against Chris Osgood in a 5–3 loss to the Islanders. Belak appeared in 16 playoff games for Toronto, getting one goal and 18 PIM. He had his most productive season during 2002–03, as Belak had three goals and nine points in 55 games, as well as a team high 196 PIM. In the playoffs, Belak appeared in two games, getting no points and four penalty minutes.