The Arizona Diamondbacks have reached an agreement with right fielder Justin Upton on a six-year contract, sources told ESPN.

The deal is worth approximately $51 million, sources told ESPN’s Pedro Gomez.

“Justin, we’ve worked very hard on the relationship, he’s done his part,” Diamondbacks General Manager Josh Byrnes told MLB.com. “What he’s done at his age is Hall of Fame caliber. So the relationship is very strong.”

FoxSports.com first reported that Upton and the Diamondbacks were closing in on a deal, expected to be announced Wednesday.

The contract would cover all three years in which Upton, 22, would be eligible for salary arbitration, as well as his first two years of eligibility for free agency. Without a new deal, Upton would have been eligible for arbitration after this season.

In 2009, Upton hit .300 with 26 home runs and 86 RBIs — all improvements over his 2008 production.

Source: ESPN