Game 1 photos: Islanders at Bruins

Boston Bruins defenseman Charlie McAvoy (73) loses his helmet as he fights with New York Islanders defenseman Ryan Pulock in the second period of Game 1 during an NHL hockey second-round playoff series, Saturday, May 29, 2021, in Boston.

New York Islanders goaltender Ilya Sorokin (30) catches the puck as Islanders defenseman Nick Leddy (2) defends against Boston Bruins center Brad Marchand (63) in the second period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

Boston Bruins left wing Nick Ritchie (21) celebrates in front of New York Islanders defenseman Adam Pelech (3) and goaltender Ilya Sorokin (30) after a goal by Bruins defenseman Charlie McAvoy (not shown) as Bruins' Sean Kuraly (52) joins the celebration in the third period of Game 1 during an NHL hockey second-round playoff series, Saturday, May 29, 2021, in Boston.

Hats rain down after David Pastrnak #88 of the Boston Bruins (not pictured) scores his third goal of the game during the third period against the New York Islanders in Game One of the Second Round of the 2021 Stanley Cup Playoffs at the TD Garden on May 29, 2021 in Boston, Massachusetts.

David Pastrnak #88 of the Boston Bruins celebrates with teammate Patrice Bergeron #37 after his goal during the second period against Ilya Sorokin #30 of the New York Islanders during the second period in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

Boston Bruins center Brad Marchand (63) watches the puck go airborne along with New York Islanders goaltender Ilya Sorokin (30) and defenseman Ryan Pulock (6) in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

New York Islanders right wing Kyle Palmieri (21) dumps Boston Bruins defenseman Brandon Carlo (25) to the ice in the second period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

New York Islanders defenseman Scott Mayfield (24) checks on Islanders goaltender Ilya Sorokin (30) after Sorokin lost his helmet during action against the Boston Bruins in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021.

David Pastrnak of the Boston Bruins (not pictured) scores during the second period against Ilya Sorokin of the New York Islanders in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

David Pastrnak #88 of the Boston Bruins celebrates with teammate Patrice Bergeron #37 after his goal during the second period against Ilya Sorokin #30 of the New York Islanders during the second period in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

Craig Smith #12 of the Boston Bruins checks a player from the New York Islanders during the second period in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

New York Islanders goaltender Ilya Sorokin (30) keeps the puck in front as Boston Bruins center David Krejci (46) tries to score in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

Referees keep Boston Bruins left wing Nick Ritchie (21) from fighting with New York Islanders left wing Matt Martin (17) and right wing Cal Clutterbuck (15) in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

Boston Bruins center Brad Marchand (63) falls into New York Islanders defenseman Adam Pelech (3) and goaltender Ilya Sorokin (30) in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

Anthony Beauvillier #18 of the New York Islanders celebrates his goal against the Boston Bruins during the first period with teammates in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

Adam Pelech #3 of the New York Islanders checks Sean Kuraly #52 of the Boston Bruins during the first period in Game One of the Second Round of the Stanley Cup Playoffs at the TD Garden on May 29, 2021.

Boston Bruins defenseman Jeremy Lauzon (55) goes to the ice after chasing the puck against New York Islanders right wing Kyle Palmieri (21) in the first period of Game 1 during an NHL hockey second-round playoff series, Saturday, May 29, 2021, in Boston. (AP Photo/Elise Amendola)

New York Islanders center Jean-Gabriel Pageau, right, watches the puck slip by Boston Bruins goaltender Tuukka Rask for a goal by Islanders left wing Anthony Beauvillier in the first period of Game 1 during an NHL second-round playoff series, Saturday, May 29, 2021, in Boston.

A full capacity crowd watch Boston Bruins players warm up for Game 1 of an NHL hockey second-round playoff series against the New York Islanders, Saturday, May 29, 2021, in Boston.

Ilya Sorokin #30 of the New York Islanders warms up before Game One of the Second Round of the 2021 Stanley Cup Playoffs against the Boston Bruins at the TD Garden on May 29, 2021.