Sources: J.D. Martinez agrees to five-year, $110 million deal with Boston Red Sox

Outfielder J.D. Martinez, who hit more home runs last season than all but Giancarlo Stanton and Aaron Judge, on Monday agreed with the Boston Red Sox on the terms of a five-year contract worth roughly $110 million, according to sources.

The deal, which includes an opt-out clause for Martinez, is pending a physical.

Martinez was the best power hitter on the market. The Red Sox, last in the American League in home runs in 2017 (following the retirement of David Ortiz), sought power and had an opening at designated hitter. Still, negotiations were slow, reflecting the overall tenor of baseball’s winter market. Near the end, as position players reported to camps, Martinez’s agent, Scott Boras, was reported to be receiving interest from the Red Sox and Arizona Diamondbacks.

18 PHOTOS
2017 MLB Silver Slugger winners
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2017 MLB Silver Slugger winners

Catcher, American League: Gary Sanchez, New York Yankees

(Photo by Paul Bereswill/Getty Images)

Catcher, National League: Buster Posey, San Francisco Giants

(Photo by Ezra Shaw/Getty Images)

First base, American League: Eric Hosmer, Kansas City Royals

(Photo by Nick Tre. Smith/Icon Sportswire via Getty Images)

First base, National League: Paul Goldschmidt, Arizona Diamondbacks

(Photo by Norm Hall/Getty Images)

Second base, American League: Jose Altuve, Houston Astros

(Photo by Ezra Shaw/Getty Images)

Second base, National League: Daniel Murphy, Washington Nationals

(Photo by Quinn Harris/Icon Sportswire via Getty Images)

Shortstop, American League: Francisco Lindor, Cleveland Indians

(Photo by Brace Hemmelgarn/Minnesota Twins/Getty Images)

Shortstop, National League: Corey Seager, Los Angeles Dodgers

(Photo by Harry How/Getty Images)

Third base: Jose Ramirez, Cleveland Indians

(Photo by Frank Jansky/Icon Sportswire via Getty Images)

Third base, National League: Nolan Arenado, Colorado Rockies

(Photo by Denis Poroy/Getty Images)

Outfield, American League: Aaron Judge, New York Yankees

(Photo by Cooper Neill/MLB Photos via Getty Images)

Outfield, American League: Justin Upton, Detroit Tigers and Los Angeles Angels

(Photo by Stephen Dunn/Getty Images)

Outfield, American League: George Springer, Houston Astros

(Photo by Christian Petersen/Getty Images)

Designated hitter, American League: Nelson Cruz, Seattle Mariners

(Photo by Richard W. Rodriguez/Getty Images)

Outfield, National League: Giancarlo Stanton, Miami Marlins

(Photo by Rob Foldy/Miami Marlins via Getty Images)

Outfield, National League: Marcell Ozuna, Miami Marlins

(Photo by Norm Hall/Getty Images)

Outfield, National League: Charlie Blackmon, Colorado Rockies

(Photo by Thearon W. Henderson/Getty Images)

Pitcher, National League: Adam Wainwright, St. Louis Cardinals

(Photo by Tim Clayton/Corbis via Getty Images)

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Though a regular outfielder over seven seasons in Houston, Detroit and Arizona, Martinez is not likely to take innings from Boston’s regular trio of outfielders – Mookie Betts, Jackie Bradley Jr. and Andrew Benintendi. Hanley Ramirez took most of Boston’s DH at-bats last season. While he hit 23 home runs (19 as DH), he also batted .242 and his OPS was .750, at or near career lows. The Red Sox also could trade Bradley to open right field for Martinez.

Released by the Houston Astros not four years ago, when he was 26 and had hit 24 home runs in nearly 900 big-league at-bats, Martinez reoriented his career over four seasons in Detroit and Arizona. Now 30, he entered free agency having hit 45 home runs (and batting .303) in 2017, and 128 in his past 1,929 at-bats, turning his finest season – only Mike Trout had a higher OPS in 2017 – into free-agency riches. Because of a foot injury sustained in spring training, Martinez missed the Tigers’ first 33 games, did not have an at-bat before May 12, and hit his first home run on May 13.

In mid-July, Martinez was traded from the moribund Tigers to the contending Diamondbacks, and his production helped propel the Diamondbacks to 93 wins. Over 62 games in Arizona, he had 29 home runs and 65 RBI. His OPS was 1.107. Four of those home runs came on one night in Los Angeles, when he became the first Diamondback and 18th player in history to homer four times in the same game. The home runs came in consecutive at-bats against four different pitchers. On Sept. 27, Martinez homered to tie Ralph Kiner’s record of 16 home runs in the season’s final month.

As he reworked his swing mechanics, approach at the plate and pregame preparation routine, Martinez credited the mentorship of former Tigers teammate Miguel Cabrera, once one of the most feared hitters in the league. In Arizona, he became a fan favorite hitting behind Paul Goldschmidt, forming one of the more fearsome one-two punches in the league until the Diamondbacks were swept in the division series by the Dodgers.

All of which seemed to position Martinez favorably in a market ahead of next year’s class, which is expected to bring the likes of Bryce Harper, Manny Machado and Josh Donaldson to the market.

Martinez’s return to Arizona seemed a long shot, as the Diamondbacks have kept their payroll under $100 million, and not so long ago seemed to regret their $206.5-million commitment to Zack Greinke. Greinke will make more than $30 million in each of the next four seasons. Goldschmidt is due a long-term extension as well. His contract runs through 2019.

30 PHOTOS
The value of each MLB team: 2017
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The value of each MLB team: 2017

30. Tampa Bay Rays

2017 value: $825 million
Growth from last year: 27%

(Photo by Brian Blanco/Getty Images)

29. Oakland Athletics

2017 value: $880 million
Growth from last year: 21%

(Richard W. Rodriguez/Fort Worth Star-Telegram/TNS via Getty Images)

Cincinnati Reds

2017 value: $915 million
Growth from last year: 1%

(Photo by Justin K. Aller/Getty Images)

27. Cleveland Indians

2017 value: $920 million
Growth from last year: 15%

(Photo by Christian Petersen/Getty Images)

26. Milwaukee Brewers

2017 value: $925 million
Growth from last year: 6%

(Photo by Dan Sanger/Icon Sportswire via Getty Images)

25. Miami Marlins

2017 value: $940 million
Growth from last year: 39%

(Photo by Rich Schultz/Getty Images)

24. Kansas City Royals

2017 value: $950 million
Growth from last year: ​​​​​​​10%

(Photo by Hannah Foslien/Getty Images)

23. Colorado Rockies

2017 value: $1 billion
Growth from last year: 16% 

(Photo by Stacy Revere/Getty Images)

22. Minnesota Twins

2017 value: $1.03 billion
Growth from last year: 13%

(Photo by Hannah Foslien/Getty Images)

21. San Diego Padres

2017 value: $1.13 billion
Growth from last year: ​​​​​​​26%

(Photo by Matthew Stockman/Getty Images)

20. Arizona Diamondbacks

2017 value: $1.15 billion
Growth from last year: ​​​​​​​24%

(Photo by Christian Petersen/Getty Images)

19. Baltimore Orioles

2017 value: $1.18 billion
Growth from last year: ​​​​​​​18%

(Photo by Greg Fiume/Getty Images)

18. Detroit Tigers

2017 value: $1.2 billion
Growth from last year: ​​​​​​​4%

(Photo by Leon Halip/Getty Images)

17. Pittsburgh Pirates

2017 value: $1.25 billion
Growth from last year: ​​​​​​​28%

(Photo by Shelley Lipton/Icon Sportswire via Getty Images)

16. Toronto Blue Jays

2017 value: $1.3 billion
Growth from last year: 44%

(Photo by G Fiume/Getty Images)

16. Chicago White Sox

2017 value: $1.35 billion
Growth from last year: 29%

(Photo by Ron Vesely/MLB Photos via Getty Images)

14. Seattle Mariners

2017 value: $1.4 billion
Growth from last year: 17%

(Photo by Stephen Brashear/Getty Images)

13. Houston Astros

2017 value: $1.45 billion
Growth from last year: ​​​​​​​32%

(Photo by Brian Rothmuller/Icon Sportswire via Getty Images)

12. Atlanta Braves

2017 value: $1.5 billion
Growth from last year: ​​​​​​​28%

(Photo by Justin K. Aller/Getty Images)

11. Texas Rangers

2017 value: $1.55 billion
Growth from last year: 27%

(Richard W. Rodriguez/Fort Worth Star-Telegram/TNS via Getty Images)

10. Washington Nationals

2017 value: $1.6 billion
Growth from last year: 23%​​​​​​​

(Photo by Win McNamee/Getty Images)

9. Philadelphia Phillies

2017 value: $1.65 billion
Growth from last year: ​​​​​​​34%

(Photo by Mitchell Leff/Getty Images)

8. Los Angeles Angels of Anaheim

2017 value: $1.75 billion
Growth from last year: ​​​​​​​31%

(Photo by Christian Petersen/Getty Images)

7. St. Louis Cardinals

2017 value: $1.8 billion
Growth from last year: ​​​​​​​12%

(Photo by Scott Kane/Icon Sportswire via Getty Images)

6. New York Mets

2017 value: $2 billion
Growth from last year: ​​​​​​​21%

(Photo by Jim McIsaac/Getty Images)

5. San Francisco Giants

2017 value: $2.65 billion
Growth from last year: 18%

(Photo by Denis Poroy/Getty Images)

4. Chicago Cubs

2017 value: $2.68 billion
Growth from last year: 22%

(Photo by Ezra Shaw/Getty Images)

3. Boston Red Sox

2017 value: $2.7 billion
Growth from last year: 17%

(Photo by Rob Carr/Getty Images)

2. Los Angeles Dodgers

2017 value: $2.75 billion
Growth from last year: ​​​​​​​10%

(Photo by Justin Edmonds/Getty Images)

1. New York Yankees

2017 value: $3.7 billion
Growth from last year: ​​​​​​​9%

(Photo by Al Bello/Getty Images)

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