Today might be the most important day of the Phillies’ spring training.

Yes, it marks the end of the team’s time in Florida, as players, coaches and others in the organization will scurry to the airport shortly after the game to travel back north. This is a notable date for sure.

But today, Roy Halladay, arguably the most important piece to the Phillies’ 2013 puzzle, takes the mound.

Halladay has been shaky in all four starts this spring, including getting battered in a minor-league game five days ago. He gave up seven hits and two runs against a minor-league Blue Jays squad over four innings, throwing 81 pitches.

He has struggled to balance his declining fastball with a new mentality.

He’s admitted he needs to become a new pitcher as the 35-year-old gets even older.

We’ll see if that strategy has taken root today as Halladay will face a stacked Jays lineup for the last Phillies game at Bright House Field until next February. The Jays will likely play their big names, including Jose Reyes, Jose Bautista, Melky Cabrera and Edwin Encarnacion.

“I think that he’s going to be OK,” Phillies manager Charlie Manuel said. “Like I said, I think it’s just a matter of him getting his energy back and feeling real good. I always say hitting’s a feel, but pitching has to be a feel, too. It’s just a matter of him getting everything together and feeling strong.”