The 2015 Boston Red Sox season was the 115th season in the franchise's Major League Baseball history. The Red Sox finished last in the five-team American League East with a record of 78 wins and 84 losses, 15 games behind the Toronto Blue Jays. It was the third last-place finish for the team in four years.
Offseason
October 2014
On October 30, 2014, the Red Sox re-signed closer RHP Koji Uehara to a two-year, $18 million contract.
November 2014
On November 24, 2014, the Red Sox signed IF Pablo Sandoval to a five-year, $100 million contract and IF/OF Hanley Ramírez to a four-year, $90 million contract.
December 2014
On December 10, 2014, the Red Sox traded RHP Rubby De La Rosa and RHP Allen Webster to the Diamondbacks for LHP Wade Miley. On December 11, 2014, the Red Sox traded OF Yoenis Céspedes, RHP Alex Wilson and prospect RHP Gabe Speier to the Tigers for RHP Rick Porcello. Later that day, the Red Sox signed RHP Justin Masterson to a one-year, $9.5 million contract. On December 17, 2014, the Red Sox traded prospect RHP Aaron Kurcz to the Braves for reliever RHP Anthony Varvaro. On December 19, 2014, the Red Sox traded 3B Will Middlebrooks to the Padres for C Ryan Hanigan. Later that day the Red Sox re-signed reliever LHP Craig Breslow to a one-year, $2 million contract.
January 2015
On January 27, 2015, the Red Sox traded RHP Anthony Ranaudo to the Rangers for LHP Robbie Ross Jr. On January 30, 2015, the Red Sox signed RHP Alexi Ogando to a one-year, $1.5 million contract.
February 2015
On February 21, 2015, the Red Sox extended manager John Farrell's contract through 2017, with a club option for 2018. Later that day, it was revealed, that the contract of GM Ben Cherington had been extended during the 2014 campaign, for an unknown period.
March 2015
On March 30, 2015, the Red Sox acquired C Sandy León from the Washington Nationals for cash considerations.
Regular season
Opening Day
The 2015 Red Sox season opened on April 6, with an afternoon game against the Philadelphia Phillies in Citizens Bank Park. It was the first time in franchise history that the Red Sox opened the season against an interleague opponent. Clay Buchholz, in his first career Opening Day start, went seven scoreless innings, giving up three hits, one walk and striking out nine. He committed one error in the first inning and handed a 4–0 lead over to the bullpen. Junichi Tazawa and Tommy Layne held the Phillies scoreless. Dustin Pedroia and Hanley Ramírez both homered twice, two solo shots by Pedroia, a solo shot and a grand slam by Ramirez. Mookie Betts added a solo home run and Boston won 8–0.
Opening Day lineup
April
April 6–9, in Philadelphia
On April 6, right after the opening day game against the Phillies, the Red Sox announced that they signed free-agent-to-be RHP Rick Porcello to a four-year, $82.5 million contract extension through 2019, contradicting an earlier report, that both parties won't engage in contract negotiations during the season. Game 2: In game two of the three-game road series in Philadelphia, Hanley Ramírez left the bases loaded, against former Red Sox closer Jonathan Papelbon, in the top of the eighth by flying out to Ben Revere on the warning track, just missing his second grand slam of the season and Boston lost 2–4. Game 3: In the final game, Xander Bogaerts drove in three runs with a triple and pitcher Justin Masterson had one RBI in two hits and the Red Sox took the opening series with a 6–2 win. Red Sox won the series 2–1 (16–6 runs)