At the top of the list over the Mets’ final 23 games is trying to erase a wild-card deficit that stands at five games, but jobs are also on the line and milestones in play over these next three-plus weeks.

Here are five questions facing the Mets as they head toward 2019’s home stretch:

What are the Mets’ postseason chances?

Fangraphs on Thursday was giving the Mets a 10.6 percent chance to reach the playoffs — better than the Brewers (9.3 percent), Diamondbacks (8.1 percent) and Phillies (2.1 percent), all of whom are also chasing the Cubs for the NL’s second wild card. The next 10 games, all at Citi Field, will be critical for the Mets. If they can thrive against the Phillies, Diamondbacks and Dodgers, the reward is facing the sputtering Rockies, Reds and Marlins before concluding the season against a Braves team that might already have the NL East clinched and possibly trying to rest starters.

The Cubs still have seven games against the Cardinals, but can’t complain about their nine remaining against the Pirates and Padres. The Cubs opened a four-game series against the Brewers on Thursday.

How will the Mets handle second base?

Wednesday’s game could serve as a blueprint for the rest of the season: Robinson Cano began the game at second base — he delivered two hits, including a homer — and was later removed for Joe Panik. With Cano returning early from a torn left hamstring, the Mets will be vigilant to ensure he isn’t pushed too hard. Jed Lowrie still could factor into the infield mix to give the team an additional option at second and third base, but until he actually appears in a game for the Mets this season it’s difficult to get too wrapped up in how he might be deployed. Lowrie’s switch hitting is an element the Mets have lacked.

What can they do about the bullpen?

Seth Lugo and Justin Wilson are the most dependable options and Luis Avilan hasn’t been far behind. But the Mets have really missed Robert Gsellman in recent weeks and neither Edwin Diaz nor Jeurys Familia can be trusted in big spots. Outside of signing Jeremy Jeffress, a free agent in whom they have interest, the Mets might want to consider giving additional responsibility to Brad Brach, who has pitched better than his 5.63 ERA in nine appearances with the club has suggested.

Will Mickey Callaway get fired if the Mets miss the playoffs?

Probably. But if the Mets were to miss by just one or two games, it’s conceivable general manager Brodie Van Wagenen and team COO Jeff Wilpon would allow Callaway to return for the final year of his contract. Even so, the first-year GM Van Wagenen inherited Callaway as manager and might want his own guy in the dugout next season. It would be difficult to fire Callaway if the Mets reach the postseason, given the strong run it would have taken over the final weeks of September just to reach that point. But, remember, the Yankees dumped Joe Girardi after he took the team to Game 7 of the ALCS. Most of Callaway’s coaching staff is signed only through this season, meaning there could be a complete overhaul.

Will Pete Alonso set a rookie home run record?

He began Thursday as the major league leader in homers with 45, so Alonso could be in position for multiple milestones. But in Aaron Judge’s rookie record for homers, Alonso at least has a set number on which to focus: 52. As it stands — assuming he plays the Mets’ remaining 23 games — Alonso is on pace for 52.5 homers. What could make it easier is the Mets’ final road trip, which will take Alonso to Denver’s altitude and Cincinnati’s bandbox ballpark. Alonso is nearly a slam dunk to win the NL Rookie of the Year, but adding the rookie home run record and the MLB crown would cement Alonso’s season among the best ever for a first-year player.

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