The D-backs have been over .500 since April 3, the third game of the season, when they walked off against the Cardinals in a 16-inning marathon.
But after losing five straight and seven out of their past eight games, that streak could come to an end Wednesday in New York if Arizona drops its sixth consecutive game.
Boding against the D-backs' hopes of turning things around is that young star Matt Harvey will take the mound for the Mets. The right-hander is 7-1 with a 0.85 WHIP, and leads the National League in both ERA (2.00) and strikeouts (132).
In his last start against Washington, the 24-year-old went seven innings and allowed one run on three hits with no walks and 11 strikeouts. Harvey ended up with a no-decision, though, after his bullpen blew the lead.
"That's baseball," Harvey said after the game. "It happens. Today just happened to be one of those days."
Despite struggling of late, the D-backs still lead the NL West by 1 1/2 games. First and last place in the division are only separated by just three games, with the Giants bringing up the rear.
Arizona will send Randall Delgado to face off against Harvey on Wednesday. The right-hander surrendered just two runs on eight hits over six frames vs. the Braves his last time out, but he took the hard-luck loss as the D-backs were shut out.
"We didn't have much going," manager Kirk Gibson said after that game.
Mets: Germen promoted, Lutz optioned
Needing extra pitching, the Mets on Tuesday purchased the contract of right-hander Gonzalez Germen from Triple-A Las Vegas, optioning infielder Zach Lutz to the Minors.
Germen, who was called up for the first time in his career, posted a 5.70 ERA with 48 strikeouts and 10 walks in 42 2/3 innings at Las Vegas.
"Most of them, one thing about them, they've been in Triple-A for a couple years, if not three years," Mets manager Terry Collins said. "They're starting to really need the opportunity to show that they can play at this level."
D-backs: Bell to close again
After J.J. Putz blew his first save opportunity Monday since coming off the 15-day disabled list, D-backs manager Kirk Gibson put Heath Bell back in the closer's role for the D-backs on Tuesday.
"Since he's been back, the ball hasn't come out of his hand the way it can," Gibson said of Putz. "Just not only with his fastball, but with his split, he just doesn't have the arm speed right now. We're going to use him in different type of situations and try to get his arm strength up. Maybe his arm is a little dead right now."
Putz was on the DL from May 8 until this past Saturday with a strained right elbow.
Overall, the bullpen is 22 out of 38 save chances.
• Mets first baseman Josh Satin has reached base safely in 13 straight games. He is riding a career-best eight-game hitting streak as well.
• D-backs starters have not recorded a win (0-11) in their past 24 starts since June 5.
Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.