• Paul Goldschmidt and J.D. Martinez share insights on each other

    Paul Goldschmidt and J.D. Martinez share insights on each other

  • Greinke looks ahead to his wild-card start

    Greinke looks ahead to his wild-card start

  • Lovullo discusses the wild-card game against the Rockies

    Lovullo discusses the wild-card game against the Rockies

  • Shot Clock: Zack's comfort dog? Wild-card preview

    Shot Clock: Zack’s comfort dog? Wild-card preview

  • Piecoro, Moore on D-Backs' preparations ahead of wild-card game

    Piecoro, Moore on D-Backs’ preparations ahead of wild-card game

  • Lovullo on Martinez: 'As good a hitter ... that I've been around'

    Lovullo on Martinez: ‘As good a hitter … that I’ve been around’

  • D-Backs' Pollock on facing Rockies starter Jon Gray

    D-Backs’ Pollock on facing Rockies starter Jon Gray

  • Torey Lovullo on Paul Goldschmidt's stats, focus

    Torey Lovullo on Paul Goldschmidt’s stats, focus

  • D-Backs' Pollock on security concerns for wild-card game

    D-Backs’ Pollock on security concerns for wild-card game

  • D-Backs' manager Torey Lovullo on Walker, Bradley vs. Royals

    D-Backs’ manager Torey Lovullo on Walker, Bradley vs. Royals

  • Archie Bradley after loss to Royals

    Archie Bradley after loss to Royals

  • Torey Lovullo after Greinke's loss vs. Royals

    Torey Lovullo after Greinke’s loss vs. Royals

  • Zack Greinke on his outing vs. Royals

    Zack Greinke on his outing vs. Royals

  • J.D. Martinez's on his record-tying home run

    J.D. Martinez’s on his record-tying home run

  • David Peralta on his walk-off walk, J.D. Martinez's hitting

    David Peralta on his walk-off walk, J.D. Martinez’s hitting

  • J.D. Martinez on his hot streak, D-Backs' win over Giants

    J.D. Martinez on his hot streak, D-Backs’ win over Giants

  • Robbie Ray after win vs. Giants

    Robbie Ray after win vs. Giants

  • Zack Godley after loss vs. Giants

    Zack Godley after loss vs. Giants

  • Paul Goldschmidt after D-Backs clinch wild card spot

    Paul Goldschmidt after D-Backs clinch wild card spot

  • D-Backs celebrate walk-off win over Miami

    D-Backs celebrate walk-off win over Miami

  • Diamondbacks celebrate playoff berth

    Diamondbacks celebrate playoff berth

  • Fernando Rodney on his 300th career save

    Fernando Rodney on his 300th career save

  • Chris Iannetta on his 8-RBI night in D-Backs' win

    Chris Iannetta on his 8-RBI night in D-Backs’ win

  • Archie Bradley answers questions from reporters – and J.D. Martinez

    Archie Bradley answers questions from reporters – and J.D. Martinez

  • Torey Lovullo after D-Backs avoid sweep in San Diego

    Torey Lovullo after D-Backs avoid sweep in San Diego

  • Torey Lovullo on recent offensive struggles after loss to Padres

    Torey Lovullo on recent offensive struggles after loss to Padres

  • A.J. Pollock on his two-homer game vs. Padres

    A.J. Pollock on his two-homer game vs. Padres

  • D-Backs' Zack Godley after loss to Padres

    D-Backs’ Zack Godley after loss to Padres

  • Patrick Corbin on mistakes vs. Padres

    Patrick Corbin on mistakes vs. Padres

  • Torey Lovullo on D-Backs' loss to Padres

    Torey Lovullo on D-Backs’ loss to Padres

  • Taijuan Walker on shaky outing vs. Giants

    Taijuan Walker on shaky outing vs. Giants

  • Torey Lovullo after loss to Giants

    Torey Lovullo after loss to Giants

  • Zack Greinke after 2-0 win over Giants

    Zack Greinke after 2-0 win over Giants

  • Torey Lovullo on Greinke's dominant start vs. Giants

    Torey Lovullo on Greinke’s dominant start vs. Giants

  • Robbie Ray after 10-strikeout game vs. Giants

    Robbie Ray after 10-strikeout game vs. Giants

  • Archie Bradley on baseball and beards

    Archie Bradley on baseball and beards

  • Torey Lovullo on Pollock's two-run double, Ray's outing

    Torey Lovullo on Pollock’s two-run double, Ray’s outing

  • Shot Clock: D-Backs' Archie Bradley talks football

    Shot Clock: D-Backs’ Archie Bradley talks football

  • Zack Godley on his outing against the Rockies

    Zack Godley on his outing against the Rockies

  • Torey Lovullo on big win over Rockies

    Torey Lovullo on big win over Rockies

  • Paul Goldschmidt downplays his 1,000th career hit

    Paul Goldschmidt downplays his 1,000th career hit

  • Lovullo discusses his team's win over the Rockies

    Lovullo discusses his team’s win over the Rockies

  • D-Backs' A.J. Pollock on his three-hit night

    D-Backs’ A.J. Pollock on his three-hit night

  • Patrick Corbin on his outing against the Rockies

    Patrick Corbin on his outing against the Rockies

  • Shot Clock: D-Backs stay ahead of Rockies?

    Shot Clock: D-Backs stay ahead of Rockies?

  • Torey Lovullo on loss to Rockies

    Torey Lovullo on loss to Rockies

  • J.D. Martinez following D-Backs' loss to Rockies

    J.D. Martinez following D-Backs’ loss to Rockies

  • Taijuan Walker on his outing against the Rockies

    Taijuan Walker on his outing against the Rockies

  • Diamondbacks' rally falls short against Rockies

    Diamondbacks’ rally falls short against Rockies

  • Robbie Ray on his outing vs. Padres

    Robbie Ray on his outing vs. Padres

  • Manager Torey Lovullo on D-Backs' win, Bradley's save

    Manager Torey Lovullo on D-Backs’ win, Bradley’s save

  • Diamondbacks react to 'tough' loss to Padres

    Diamondbacks react to ‘tough’ loss to Padres

  • Coyotes take batting practice at Chase Field

    Coyotes take batting practice at Chase Field

  • Torey Lovullo on the end of the D-Backs' win streak

    Torey Lovullo on the end of the D-Backs’ win streak

  • Paul Goldschmidt says his elbow is structurally sound

    Paul Goldschmidt says his elbow is structurally sound

  • Zack Greinke after D-Backs' win over Dodgers

    Zack Greinke after D-Backs’ win over Dodgers

  • Torey Lovullo on D-Backs' record-tying 12th consecutive win

    Torey Lovullo on D-Backs’ record-tying 12th consecutive win

  • Shot Clock: JD rocks LA; Cards chase Seattle

    Shot Clock: JD rocks LA; Cards chase Seattle

  • J.D. Martinez on his four-homer night vs. Dodgers

    J.D. Martinez on his four-homer night vs. Dodgers

  • Paul Goldschmidt talks about his sore right elbow

    Paul Goldschmidt talks about his sore right elbow

  • Torey Lovullo on J.D. Martinez's four-homer performance

    Torey Lovullo on J.D. Martinez’s four-homer performance

  • Robbie Ray after striking out career-high 14 vs. Dodgers

    Robbie Ray after striking out career-high 14 vs. Dodgers

  • Torey Lovullo on D-Backs' 10th consecutive win

    Torey Lovullo on D-Backs’ 10th consecutive win

  • Zack Godley on wild yet effective outing vs. Rockies

    Zack Godley on wild yet effective outing vs. Rockies

SAN FRANCISCO – Just how much money J.D. Martinez commands on the open market this winter is anyone’s guess, but one thing is hard to dispute about the Diamondbacks slugger’s price tag.

“It keeps going up,” a scout with a National League club said.

Martinez entered Friday night’s game against the San Francisco Giants having played 49 games with the Diamondbacks, who acquired him in a July 18 trade with the Detroit Tigers. He had connected for 23 homers for his new team, the second-most in the majors during that time, trailing only the 26 hit by the Marlins’ Giancarlo Stanton.

Martinez’s performance has led to speculation about what kind of contract, both in years and dollars, he might land. He figures to be the best bat available on the free-agent market, a power hitter who also hits for average and draws walks. But he’s regarded as a subpar fielder, both by scouts and defensive metrics, and some scouts wonder about how his body and athleticism will respond as he gets older.

Still, a panel of scouts and executives surveyed don’t think Martinez will have any trouble securing a huge deal, drawing comparisons ranging from Hunter Pence’s five-year, $90 million contract to Justin Upton’s six-year, $132.75 million deal. No one expects a deal as long as Jason Heyward’s eight-year, $184 million, but Heyward’s $23 million annual average value could be comparable, one scout said.

NL wild-card game: Live updates and analysis from D-Backs game vs. Rockies

Many are also envisioning deep-pocketed clubs, including perhaps the Boston Red Sox, jumping in on the bidding, a factor that could drive up the price.

“I think he’ll get $100 million from a big-market team,” a high-ranking talent evaluator for a National League club said. “He’s going to be much more attractive to teams that can offer designated hitter at-bats, but his bat should get him close to $100 million.”

Martinez said earlier this month he would “love” to return to the Diamondbacks, but it’s hard to envision the club being able to afford him barring an unforeseen development like an increase in spending or the freeing up of payroll space.

Since the start of 2014, Martinez owns a .930 OPS (on-base-plus-slugging), a mark that ranks sixth in the majors behind five players commonly mentioned among the best hitters in baseball: Mike Trout (.994), Joey Votto (.979), Paul Goldschmidt (.962), Bryce Harper (.942) and Stanton (.938).

“I think he’s still improving,” the evaluator said. “He’s just a guy that seems to really know who he is now, and guys like that – with his swing and power – are scary, like late-era David Ortiz.”

Martinez played most of this season at age 29, meaning he’ll be entering his age-30 season. A long-term deal would take him into his mid-30s. For a player whose defense is already considered suspect, that could drive down his earning power in an era when clubs are more focused on defensive value.

“I’ve seen some metrics that rate him as the worst defensive outfielder in baseball,” said a high-ranking evaluator with an American League club. “Clubs are going to have to make an assessment on how the defense is going do with age, and players don’t get better defensively when they’re on the wrong side of 30.”

The evaluator did see an argument for believing Martinez could age well as a hitter.

“He does have that (revamped) swing, and players do get smarter,” he said. “He’s a player who has power and patience and those players tend to age pretty well. The one thing is, with him, how much of that he’s able to tap into is in how well he manages his strikeouts.”

Said the NL scout: “The below-average defensive metrics and some concern about what happens to the body and athleticism could depress his market. But the man is going to get paid.”

RELATED: Just dingers: Every home run J.D. Martinez has hit for D-Backs

MORE: J.D. Martinez, Zack Godley key win over Colorado Rockies

RELATED: J.D. Martinez interested in sticking around long term

Reach Piecoro at (602) 444-8680 or [email protected] Follow him on Twitter @nickpiecoro.

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Saturday’s game

Diamondbacks at Giants

When: 6:05 p.m.

Where: AT&T Park, San Francisco.

Pitchers: Diamondbacks RHP Zack Greinke (16-6, 2.99) vs. Giants LHP Madison Bumgarner (3-8, 3.55).

TV/Radio: FSAZ/KMVP-FM (98.7), KHOV-FM (105.1).

This will be the second time Greinke has matched up with Bumgarner this season. The first time was on Opening Day, when Greinke gave up two runs in five innings on 92 pitches. … Greinke has a 2.03 ERA in his past four starts, going at least six innings in each outing. … He’s holding lefties (.643) and righties (.642) to a nearly identical OPS (on-base-plus-slugging). … On Opening Day, Bumgarner did not allow a baserunner for the first 5 1/3 innings. He gave up three runs in seven innings that day, and allowed two runs in seven innings in each of his past two starts against the Diamondbacks on Aug. 4 and Aug. 26. … His results have not been good in his past two outings; he has given up 11 earned runs in 11 innings in losses to the White Sox and Cardinals. 

Coming up

Sunday: At San Francisco, 1:05 p.m., Diamondbacks RHP Taijuan Walker (9-7, 3.32) vs. Giants RHP Chris Stratton (2-3, 4.07).

Monday: At San Diego, 7:10 p.m., Diamondbacks LHP Patrick Corbin (14-12, 4.06) vs. Padres RHP Luis Perdomo (7-10, 4.61).

Tuesday: At San Diego, 7:10 p.m., Diamondbacks RHP Zack Godley (8-7, 3.00) vs. Padres LHP Travis Wood (1-3, 6.91).