In the world of the improbable, what happened on Wednesday night at Citi Field doesn’t quite match the home run Sean Burroughs hit for the Diamondbacks two years ago, a shot manager Kirk Gibson has referenced multiple times during this free-fall of a road trip. But to snap a five-game losing streak with Randall Delgado outdueling the great Matt Harvey? To score more runs on Harvey than any team has this season, all with Paul Goldschmidt out of the starting lineup? Well, it’s probably not a stretch to call the Diamondbacks’ 5-3 win over the New York Mets unlikely, certainly not when you consider how this road trip has gone. Delgado threw seven strong innings, setting a career-high with nine strikeouts, and Cody Ross’ three-run home run off Harvey in the sixth put the Diamondbacks ahead for good, and for the first time in nearly a week they resembled the first-place team they are. With the win, the Diamondbacks moved to 21/2 games up in the National League West, in which there is now a tie for second-place between the Colorado Rockies and the hard-charging Los Angeles Dodgers, who won again Wednesday night. The Diamondbacks will have a chance to finish this otherwise miserable sojourn on an upbeat note if they can win again this afternoon and salvage a split of this four-game series. Through it all, Gibson has tried to stay positive, tried to illustrate that no matter how bleak the current landscape might look, the Diamondbacks are just one swing away from turning things around. To that end, he has invoked the name of Burroughs, the journeyman whom the Diamondbacks signed out of retirement in 2011. That same August, on a similar trek along the East Coast, the Diamondbacks fell into a slump, losing six in a row as their bats went ice cold. But it was Burroughs who drilled a two-run shot — his first home run in more than six years — to give the Diamondbacks a win over the Nationals, spurring a nine-game win streak that put them in the driver’s seat for an NL West title. The Diamondbacks’ lineup didn’t look especially imposing on Wednesday night, not with Goldschmidt on the bench or the recently recalled and light-hitting Tony Campana at the top of the order. And Harvey, who earlier this season graced the cover of Sports Illustrated, entered the day with some of the best numbers of any starting pitcher in baseball and momentum to start this month’s All-Star Game, which will be held here in his home ballpark.