Shifting powers within the National League East have created a new dynamic as the July 31 non-waiver Trade Deadline approaches, with more potential buyers than sellers dotting the landscape. The Braves, Nationals and Phillies all believe they have legitimate chances to make the postseason, while the Mets aren't quite counting themselves out yet, either.
Many general managers like to slice regular seasons into three segments, using the first to learn about their teams, the second to take action, and the third to let the chips fall where they may. But while each NL East team is well into Phase 2 of that plan, they all still have unanswered questions clouding their futures:

BRAVES
The question: Can Atlanta keep this up?
This question is layered deeper than it might appear. Every year, a rebuilding team or two tends to rise to contention sooner than expected, as the Braves have done in shooting out to first place. If they play their cards right at the Deadline, Atlanta could add a reliever, a bench bat or even a starting pitcher if its budget allows. But the Braves won't likely address all of those areas, knowing they needs to maintain a strong farm system and a responsible budget to keep the window of contention open as long as possible.
How Atlanta performs over the next three to four weeks could have a major impact on what it does at the Deadline. A strong run could prompt more aggression from the Braves in trade talks. Less dynamic play might convince them to stay conservative, knowing that no matter what happens this year, they're a team with oodles of potential for 2019.

MARLINS
The question: Which veterans will be on the move?
There's little doubt the Marlins will sell off pieces prior to the Trade Deadline. The only question is which ones?
Teams seeking catching help -- the Red Sox, Brewers and Angels spring to mind -- will surely ask about J.T. Realmuto, but there's doubt within the industry that Miami would deal him. When the Mets checked in earlier this year, they came away with the impression that the Marlins wanted to keep their standout catcher.
That could change as the deadline nears, but even if it doesn't, Miami has assets to spare. First baseman Justin Bour, second baseman Starlin Castro, starting pitcher Dan Straily and reliever Kyle Barraclough all could fetch interesting returns, considering they are under contractual control for multiple seasons. Like Realmuto, all of them have been involved in trade rumors in the past.
In any event, Marlins president of baseball operations Michael Hill is about to become a popular man.

METS
The question: When will the superstars return (and will it be too late)?
Yoenis Cespedes and Noah Syndergaard have combined to miss more than two months with injuries that the Mets once considered relatively minor -- a strained right hip flexor for Cespedes, a strained right index finger for Syndergaard. The team still doesn't have much of a timetable for either, complicating its attempt to push back into playoff contention. With Cespedes and Syndergaard active and healthy, the Mets believe they can make a late run at an NL Wild Card berth. Without them, the team might be inclined to look toward 2019.
Last summer, general manager Sandy Alderson provided a blueprint of what a yard sale could look like before (and after) July 31, dealing away Lucas Duda, Addison Reed, Jay Bruce, Neil Walker and Curtis Granderson for a cadre of high-upside relievers. This year's inventory of pending free agents is not quite so robust, with only Jeurys Familia and Asdrubal Cabrera potentially attractive to buyers. The Mets could pivot on their longstanding philosophy and deal away Jacob deGrom or Syndergaard, but trading either would indicate a full-scale rebuild -- something they do not appear willing to undertake.
Right now, the Mets see deGrom, Syndergaard and Cespedes as critical parts of their 2019 team. A return to health for the latter two players would do wonders for the team's outlook in '18 and beyond.

NATIONALS
The question: When will Bryce Harper be Bryce Harper again?
The Nationals have performed well enough without the usual output from Harper, whose batting average, on-base percentage and slugging mark are all down significantly from last season -- some of his major offensive statistics are down even from 2016, when rumors of a shoulder injury dogged him all summer. But Washington hasn't been able to upend Atlanta, which features the division's best offense (and statistically speaking, it's not particularly close).
It's not as if Harper, who leads the NL with 19 home runs, has been unproductive. It's just that he's far from the NL MVP Award candidate the Nats expected him to be. The good news for Washington? Harper's breakout appears to be a matter of when, not if. His average exit velocity is at its highest point since his 2015 NL MVP Award-winning season, while his batting average on balls in play is at a career low. Certainly, defensive shifts have played a role in that, but Harper is too elite of a hitter to stay this unproductive for long. How quickly he turns it around could well determine the NL East title.

PHILLIES
The question: Can Phils survive (or thrive) without a closer?
Philadelphia's Opening Day closer, Hector Neris, lost the job in May, and it didn't stop there, as he slid all the way to Triple-A this week. For now, the Phillies are going closer-by-committee, with Adam Morgan nailing down a rogue save on Wednesday. As new-school as they come, manager Gabe Kapler doesn't believe in set bullpen roles, preferring to use his best relievers in the highest-leverage spots. But decades of history suggests that strategy doesn't often work over a 162-game season, and the Phils' ninth-inning issues don't appear to be disappearing.
A team with issues on the left side of its infield won't necessarily be able to splurge on a closer before the Deadline, even with Familia and Zach Britton among those potentially available. Instead, there's a good chance it will be up to Seranthony Dominguez, Edubray Ramos and the rest of the Phillies' in-house mix to make Kapler's strategies work.