Rodriguez delivers a knockout blow in the season's key moment

Alex Rodriguez and Brad Lidge were essentially having the same postseason - surprisingly good ones - until they met in the ninth inning of Game 4 of the World Series, in the moment that will likely define the 2009 season.

It was a riveting sequence. Tie game, two on, two out, closer vs. clean-up hitter. And it was Rodriguez who erased all the doubts.

His line-shot double off the wall in left scored Johnny Damon with the go-ahead run, and Jorge Posada's two-run single gave Mariano Rivera two more insurance runs as the Yankees stand on the doorstep of their 27th title after beating the Phillies 7-4, taking a 3-1 lead in the best-of-seven World Series.

Sunday's Game 4 was the kind of game that defines a series and a season. The Phillies needed to win more, and when Pedro Feliz hit a solo homer in the bottom of the eighth to tie the game against Joba Chamberlain, they had life. (That straight-as-an-arrow fastball is the reason Chamberlain would not be a good closer long-term. It just took three Phillies batters to time it.)

And then Lidge comes on in the ninth and blows away Hideki Matsui and Derek Jeter, the same way he did the Rockies and the Dodgers in the first two rounds, bringing Johnny Damon to the plate.

Damon strokes a clean single to left in a nine-pitch battle with Lidge, then steals second with an infield shift on. When Damon realizes that nobody is covering third, he just keeps running - Lidge's first breakdown - and an alert Damon ratchets the pressure on Lidge even higher. Lidge then hits Mark Teixeira with a pitch, and A-Rod comes through with the game on the line again, just as he didn't do in so many past postseasons that Yankees fans had lost count.

If Damon or Teixeira or Rodriguez is retired, the Phillies have the top of the order at the plate against a Yankees middle reliever in a tie game. Trailing, they have to face Mariano Rivera. Game over.

Rivera got his lead, and the two runs that Posada provided with his gap shot made it academic. Rivera threw a few cutters - everybody in the ballpark knows it's coming, but can't do a thing about it - and the Phillies succumbed to the inevitable.

The Phillies' fatal flaw against the Yankees is that their lineup is too left-handed to be consistently effective. Aside from Chase Utley, they don't hit Sabathia well. Andy Pettitte is left-handed. Lefty Damaso Marte has been effective out of the bullpen. And then there's Rivera, who is death to lefties with the cut fastball that rides in on the bat's handle. He now throws it every single pitch to lefties. Every single pitch. Jimmy Rollins, Ryan Howard, Shane Victorino, Raul Ibanez - they all bat left-handed. Feliz, Carlos Ruiz and Jayson Werth are all hitting better in the clutch than those lefties.

Game 5 is tonight, and Cliff Lee must come through again just to send the series back to New York. As Joe Girardi noted after Game 1, Lee can't pitch every day. And that's why they should be planning for a parade in New York.