It’s deja boo all over again. How does one explain it? Two straight Septembers on the final day against the same opponent at home, the Mets season ended in awful fashion at the hands of the division rival Marlins.

Imagine making more baseball history but only the wrong kind becoming the first ever team to lead their division by at least three and a half games with the same 17 games left only to miss two straight postseasons. How could it happen all over again? Sure. The way it did was very different than last year’s season finale in which the Marlins pummeled Tom Glavine into oblivion routing them 8-1 in a game which was over before you were in your seat.

This time, they got five shutout innings from future free agent Oliver Perez matching zeros with Florida southpaw Scott Olsen. Trouble was this was the same opposing starter they’d banged around in three previous outings to the tune of over a 7.00 ERA. Suddenly, the Mets couldn’t hit him which meant the longer the game remained scoreless, the worse feeling you got. Why couldn’t they use the momentum from one of the greatest games pitched by a Met and jump all over him?

Only this team could not take anything into another do or die situation off a brilliant performance from Johan Santana, who dominated the Marlins on three days rest much the way John Maine flirted with the franchise’s first no-hitter on another Saturday a year ago. Instead, the final regular season game at Shea Stadium soon teased a packed house into Believing’ like the team mantra that it would be different when Carlos Beltran answered Florida’s pair of runs with a two-run home run in the sixth to tie it.

But they were in store for an even more heartbreaking conclusion because thanks to the rain, the Brewers and Cubs were playing at the same time with Chicago holding a 1-0 lead until a seventh inning bases loaded Craig Counsell walk forced in the tying run. Suddenly, you had two teams both tied late with no clue whether one would take the wild card or both would wind up in a one-game playoff which would’ve taken place later today at Shea. Any Met fan after Friday night would’ve signed for that.

However, it just wasn’t meant to be as two eighth innings couldn’t have played out any more different cause while Florida pinch hitter Wes Helms greeted Scott Schoeneweis’ first and only pitch with a leadoff homer and Dan Uggla followed suit taking Luis Ayala deep for a 4-2 lead, there was Milwaukee left field slugger Ryan Braun taking Bob Howry’s first pitch out to left for a go-ahead two-run blast providing ace C.C. Sabathia with a 3-1 lead. Plenty for the rental who like Santana pitched on short rest a third straight time finishing the game for his NL best seventh complete game in 17 starts.

Ironically, Braun’s 37th came about two minutes later fully aware they got help from a Marlin team which once again got the last laugh celebrating for the final time on the Mets’ home field.

Somewhere, Willie Randolph had to be smiling. Though replacement Jerry Manuel certainly did a respectable job turning around a flawed team which somehow wasn’t fixed by Omar Minaya, who’s about to be renewed for the same four years he gave to Luis Castillo, who lost his spot at second to fourth string journeyman Ramon Martinez this weekend.

If you want to blame the Mets pigpen for this, it would be very easy to but what about the offense? Where was it? They did nothing in the series opener following one of the most improbable two out rallies before beating the Cubs. And in a game which Santana had to be near perfect in, New York managed just two runs on six hits stranding 10 while striking out 10 times against opposing starter Ricky Nolasco- one more than their Cy caliber stud had.

You still would’ve believed they could muster more than they came up with on the final Sunday of the season. They would be inspired after such a magnificent performance. Not exactly. If not for Beltran’s 27th, they get blanked on just three more hits with everything on the line.

Sure. They didn’t go quietly putting the tying runners on base before veteran Arthur Rhodes got Carlos Delgado to line out to deep left to end the eighth.

Of course, David Wright made yet another useless weakly popping to second starting off the ninth to boos. Endy Chavez, who made a great diving catch in the seventh robbing Jorge Cantu of a go-ahead double couldn’t come through at the plate bouncing back to ex-Met Matt Lindstrom for the second out. Too bad they didn’t keep him dealing him away for virtually nothing three years ago.

At least one of the few character guys Damion Easley came up and worked a walk to send the tying run Ryan Church to the plate allowing everyone in the place to stand praying for one more Miracle of ’69. He gave a Lindstrom offering a ride to deep right center but it unfortunately didn’t have enough distance allowing Florida’s Cameron Maybin to get to the edge of the track and squeeze the final out of the Mets season breaking more hearts on a day they closed Shea for good.

Somehow after another bitter conclusion, they pulled off a very nice ceremony honoring heroes of the past which ranged from Tom Seaver, Jerry Koosman, Cleo Jones, Tommy Agee, Mike Piazza, John Franco, Al Leiter, Robin Ventura to ’86 members Keith Hernandez, Ron Darling, Sid Fernandez, Bob Ojeda, Gary Carter, Dwight Gooden, Darryl Strawberry, Howard Johnson, Len Dykstra, Wally Backman and the man who closed out the Astros and Red Sox Jesse Orosco, who fans must’ve wished they still had.

What remains are lingering questions as to how the Mets couldn’t deliver one big hit with runners in scoring position going 0-for-11 the entire series. Can anyone explain what happened to leading RBI man Wright who tied one of the all-time great Mets Piazza for a share of the franchise RBI record (124)? Why does the third baseman who’s one of two cornerstones along with Jose Reyes always seem to falter in the clutch? Speaking of the speedy Met shortstop who leads off, he had only a couple of hits in the series and another disappointing final month hitting .243 despite playing much better under Manuel.

Something’s missing which is pretty apparent to everyone except for Minaya and club owner Jeff Wilpon, who seems to believe this team “overachieved” as opposed to last year’s epic collapse.

Wrong. Injuries are part of sports and while they did lose closer Billy Wagner, Maine the final month, Church an extended period due to the team’s mishandling of his second concussion and Pedro Martinez a couple of months, they still had a healthy Santana, Perez and emerging Mike Pelfrey in their rotation along with their top five run producers.

The Yankees had their share of injuries too and didn’t make any excuses for missing their first October in 14 seasons knowing full well they underachieved which wasn’t acceptable.

You try to win with the hand you’re dealt and the fact is that these Mets led the Phillies again with 17 to play but faltered down the stretch due to poor performances against the Braves and Nationals before the final week turned into an emotional rollercoaster alternating wins and losses. Unfortunately, they began Monday with a defeat and were due for a loss yesterday.

When you go out and steal an ace like Santana, there are no more excuses. It shouldn’t have happened again.

Instead, the Mets saw their shadow with the groundhog apparently closing Shea for good.