The Boston Red Sox and manager Alex Cora today agreed to new terms on a contract, including a one-year extension through the 2021 season, with a club option for 2022. President of Baseball Operations Dave Dombrowski made the announcement.
"We have consistently been impressed by Alex at every turn," said Red Sox Chairman Tom Werner. "His knowledge of the game, ability to connect with our players, and his incredible instincts and decisiveness led us to an historic championship season. We know we are in good hands, and could not be more pleased to know he will be with us for the foreseeable future."
"Alex did a tremendous job for our club all year long and we wanted to reward him for his efforts after an amazing season," Dombrowski said. "We are extremely happy that he will be with us and leading our club on the field."
"Since day one, John and Linda Henry, Tom Werner, Mike Gordon, Sam Kennedy, and Dave Dombrowski have been incredibly supportive of me and my family, and for that I am extremely grateful," said Cora, who was named the 47th manager in Red Sox history on October 22, 2017. "For me, 2018 was not only historic, but it was special as well, both on and off the field. We have a great appreciation for our accomplishments this past year, but now our focus moves forward to the season ahead and defending our World Series title."
In his managerial debut, Cora helped lead the Red Sox to a World Series championship and the majors' highest winning percentage, going 108-54 (.667) in the regular season. Boston surpassed the franchise's previous single-season wins record of 105, which had been set 106 years ago in 1912. The Red Sox won the AL East division for a third consecutive season and 10th time overall, finishing eight games ahead of the second-place New York Yankees, Boston's largest margin of victory since the division was formed in 1969. 
The Red Sox' 108 wins are the second-most ever for a team with a rookie manager, trailing only the 1961 Yankees, who went 109-53 under the guidance of Ralph Houk. The only other manager to win at least 100 games in his first season with the Red Sox is Jake Stahl, who led Boston to a 105-47 record in 1912. Cora became only the second Puerto Rican-born manager in major league history, joining Edwin Rodriguez, who managed the Florida Marlins for parts of the 2010-11 seasons. 
Following a record-breaking regular season, Cora and the Red Sox went 11-3 in the postseason en route to the franchise's ninth World Series championship, including its fourth in the last 15 years. Cora became only the fifth individual to win a World Series in their first season as a major league manager, joining Bob Brenly (2001, Arizona Diamondbacks), Ralph Houk (1961, New York Yankees), Eddie Dyer (1946, St. Louis Cardinals), and Bucky Harris (1924, Washington Senators).
Cora also became the fifth person to lead the Red Sox to a World Series title in his managerial debut with the team, joining John Farrell (2013), Terry Francona (2004), Ed Barrow (1918), and Jake Stahl (1912). Cora and Stahl are the only two individuals to win a World Series with the Red Sox as both a player and as a manager, as Cora was an infielder for Boston during the club's 2007 championship season.