The 2010 Stanley Cup playoffs of the National Hockey League (NHL) began on April 14, 2010, after the conclusion of the 2009–10 NHL season. The Finals ended on June 9, 2010 when the Chicago Blackhawks defeated the Philadelphia Flyers in six games to win the team's fourth Stanley Cup and their first Cup since 1961. The Washington Capitals became the first team seeded first to lose a series to the eighth-seeded team after having a 3–1 lead in the series.