PHOENIX - First baseman Paul Goldschmidt was deftly tap-dancing around the elephant in the room on Friday when Diamondbacks catcher Miguel Montero jokingly called attention to it.

"Oh, you guys are talking to the rich guy!" Montero yelled toward reporters encircling Goldschmidt.

Well, technically, Goldschmidt isn't so rich yet. But sometime today, the Diamondbacks are expected to finalize a five-year, $32 million contract with their young slugger, a deal that will cover the 2014-2018 seasons and include a team option for 2019.

"If something happens then I'll be able to say something about it," he said.

Later Friday, Patrick Corbin blanked Cincinnati on two hits through six innings, strengthening his bid for a spot in Arizona's rotation in the D-backs' 2-1 loss at Chase Field.

Though Goldschmidt has spent less than 1 1/2 seasons in the majors, the D-backs view him as one of their cornerstone players. In his first full season last year, he hit .286 with 43 doubles, 20 homers, a .359 on-base and .490 slugging.

"We've talked about the 'Diamondback Way' the last couple of years several times and he's the model Diamondback guy," manager Kirk Gibson said. "The model guy."

Goldschmidt will become the latest player the D-backs have locked up to a long-term deal in the past 11 months, joining Montero (five years, $60 million), third baseman Martin Prado (four years, $40 million), second baseman Aaron Hill (three years, $35 million) and outfielder Cody Ross (three years, $26 million).

The deal is believed to be the largest by average annual value ($6.4 million) given to a position player with Goldschmidt's amount of service time. Giants left-hander Madison Bumgarner's five-year, $35 million deal is the only larger deal among players with more than one and less than two years of service time.

The left-hander Corbin, competing with Randall Delgado to be Arizona's No. 5 starter, struck out seven and walked two Friday night.

Bronson Arroyo, whose previous outing ended when he was struck in his pitching hand by a line drive, gave up a run on Jason Kubel's homer, scattering seven hits in six innings.

Ryan Ludwick got both hits off Corbin, a first-inning single and a fourth-inning double.

Kubel, batting .150 for the spring going into the game, hit his second home run of the preseason.

Corbin finished the spring 3-0 with a 2.81 ERA. Delgado, who came from Atlanta as part of the Justin Upton trade, pitches today.

Inside pitch

• D-backs outfielder Cody Ross, who Gibson confirmed will start the year on the DL with a calf strain, says he hopes to return the second week of the season.

• Arizona has a game against a split-squad Reds team today at 12:40 p.m. at Chase Field. The Reds' other split squad will face Cleveland in Goodyear.

• The D-backs open their regular season Monday at 7:10 p.m. against St. Louis at Chase Field.

Contributing: The Associated Press