Career
Petrov was drafted by the New York Islanders in the third round, 73rd overall, in the 2008 National Hockey League Entry Draft. He was considered a "blue-chip" first-round talent that dropped to the third round of the 2008 National Hockey League Entry Draft due to his contract status with Ak Bars Kazan of the Kontinental Hockey League (KHL). Petrov represented Russia at the 2010 World Junior Ice Hockey Championships, leading his team in scoring and being promoted to team captain by the end of the competition.
Petrov was the 8th overall scorer in the entire tournament.
There was a real possibility of him joining the New York Islanders of the National Hockey League (National Hockey League) for the 2010-2011 season. However, Ak Bars Kazan kept him under contract until the end of the 2014-2015 season.
On July 1, 2015, Petrov belatedly signed a one-year entry-level contract with the Islanders. However, following 13 games with the Islanders" minor league affiliate, the Bridgeport Sound Tigers, Petrov returned to Russia to play for CSKA Moscow.