The Bruins are trying to win their first Stanley Cup since 1972. Game 2 of that series will be played at 8 p.m. ET.
In 2008 and '10, when the Boston Celtics were in the NBA Finals, the Red Sox made similar adjustments with start times.
All Fenway Park gates will open at 11:40 a.m. on Saturday, with a limited opening on Yawkey Way at Gates A and D at 11:10 a.m., and NESN's pregame coverage will begin at noon.
Additionally, the Red Sox-Athletics contest will air on WEEI 850 AM, with the pregame show starting at noon. Fans can also hear the game broadcast by Spanish Baseball Productions on WWZN 1510 AM.