The Bay Bridge Series, also known as the Battle of the Bay, was a series of baseball games played between the Oakland Athletics and the San Francisco Giants, representing a rivalry between the two Major League Baseball teams. Named after the San Francisco–Oakland Bay Bridge that connects the two cities, the winner of the annual series was awarded a trophy made from a piece of the original bridge, starting in 2018.
The New York Giants won the 1905 World Series against the Philadelphia Athletics with a score of 4–1. Notable players included John McGraw, Roger Bresnahan, and Christy Mathewson for the Giants, and Connie Mack for the Athletics.
In 1911, the Philadelphia Athletics won the World Series against the New York Giants with a score of 4–1, featuring Hall of Famers like Connie Mack, Chief Bender, and Eddie Plank for the Athletics.
The Philadelphia Athletics won the 1913 World Series against the New York Giants with a score of 4–2, with notable players like Rube Waddell, Frank Baker and Eddie Collins for the Athletics.
Giants records are accounted from 1958 through their last season.
Athletics records are accounted from 1968 through their last season.
On October 17, 1989, minutes before Game 3 of the 1989 World Series, a 6.9 magnitude earthquake struck the San Francisco Bay Area, causing damage to Candlestick Park and the Oakland Coliseum. The series was delayed for 10 days.
In 1989, the Athletics won the World Series, marking the first time both the Athletics and Giants had met since they moved to the San Francisco Bay Area.
In June 1997, the Giants and Athletics met for the first time in the regular season.
In 1997, regular season games between the Athletics and Giants began with the commencement of Interleague play.
On June 12, 2010, at AT&T Park, the Giants' Barry Zito secured his first win against his former team, the Athletics, after starting 0–4 against them.
Beginning in 2018, the winner of the annual Bay Bridge Series retained a trophy fashioned from a piece of the original Bay Bridge.
In April 2023, after plans for Cisco Field were blocked and negotiations with Oakland failed, the A's purchased land near Allegiant Stadium in Las Vegas for a new stadium.
On July 25, 2023, during a game at Oracle Park, Athletics and Giants fans participated in an event called "Unite the Bay," chanting "Sell the Team" in response to the Athletics' plans for relocation.
On August 18, 2024, the final Bay Bridge Series game took place, with the Giants winning 4–2, marking the end of the series due to the A's relocation.
Giants records are accounted from 1958 and Athletics records are accounted from 1968 through their last season in Oakland in 2024, as of September 30, 2024.
In 2024, the Bay Bridge Series ended for good after the A’s relocated to Las Vegas (while relocating to Sacramento temporarily).
In 2028, the A's are scheduled to leave Oakland for Las Vegas, following an interim relocation to West Sacramento, effectively ending the Bay Bridge series rivalry.