The Los Angeles Kings selected Sydor seventh overall in the 1990 NHL Entry Draft. He played four seasons with the Kamloops Blazers of the Western Hockey League (WHL) and won a Memorial Cup championship in 1992. Sydor originally began his Memorial Cup championship season in the National Hockey League (NHL) with the Kings, but was sent back to the WHL after 18 games.\n', '

In his first full season with the Kings, Sydor tallied 29 points and helped the club to their first ever Stanley Cup Finals appearance. Led by Wayne Gretzky, they were defeated by the Montreal Canadiens. Sydor developed with the Kings, but did not reach his prime until he was traded to the Dallas Stars in 1996. He recorded a career-high 40 assists and 48 points in 1996–97 with the Stars.\n', '

During his time with Dallas, Sydor became part of the team\'s "big four" defenceman, which included Derian Hatcher, Sergei Zubov and Richard Matvichuk. This quartet played a major role in capturing the Stanley Cup in 1999 against the Buffalo Sabres. In the regular season leading up to Sydor\'s first Stanley Cup championship, he matched his career-high 48 points and established a personal best 14 goals. The following year, Sydor helped the Stars to a second consecutive Finals appearance, but would suffer an injury against the New Jersey Devils. The Stars were kept from repeating as Stanley Cup champions, falling to the Devils in six games.\n', '

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