NL West Notes: Mattingly, Goldschmidt, Gregorius

Dodgers manager Don Mattingly will soon be fired, FOX Sports' Ken Rosenthal argues. "My guess is that Mattingly gets this series, and if things don’t go better, that’s it," Rosenthal says. "The Dodgers are off Thursday, then begin a five-game homestand against the Cardinals and Angels. You can look it up — managerial changes often occur on off-days before a homestand." The Dodgers are currently 17-25 after being swept by the Braves. Rosenthal notes that GM Ned Colletti might find himself on the hot seat as well, but that the typical pattern is for the manager to be the first out the door. When asked recently whether Mattingly would remain with the Dodgers through the end of the season, team president Stan Kasten replied, "I assume so," but noted that he expected the team to play better. Here's more from the NL West.

• Despite his hot start, Diamondbacks first baseman Paul Goldschmidt isn't worried about money he might end up losing as a result of his recent extension, CBS Sports' Jon Heyman reports. "You make the best decision at the time," says Goldschmidt. "I love it in Phoenix. I was happy we got a deal done. And I'm happy to get it done in spring training, so it didn't become a distraction." Heyman cites an anonymous agent who says that the extension could cost Goldschmidt $75MM. That seems like an exaggeration, but Goldschmidt could easily make his five year, $32MM deal look like a bargain from the Diamondbacks' perspective if he continues hitting anything resembling his current .335/.418/.645 pace.
• Didi Gregorius' surprising hitting so far in the big leagues is making the Diamondbacks' end of the Shin-Soo Choo / Trevor Bauer deal with the Reds and Indians look better with time. But Nick Piecoro of the Arizona Republic wonders whether Gregorius' hitting can last. No one in the last ten years has posted a career minor-league OPS below .725 (minimum 1,900 plate appearances) and a career major-league OPS above .741 (minimum 500 plate appearances). Gregorius had a .694 career minor-league OPS; his major-league OPS through 106 plate appearances is .884.
• Rockies pitcher Roy Oswalt will join the Double-A Tulsa Drillers on Tuesday and will make his first start on Friday, ROOT Sports' Tracy Ringolsby notes (on Twitter). Ringolsby projects Oswalt would make his fifth minor-league start June 14. Oswalt can opt out of his contract with the Rockies on either June 18 or June 28 if he has not been added to the big-league roster. Oswalt's command was strong in extended spring training, MLB.com's Thomas Harding notes (on Twitter).