LEADING OFF: Big Papi dehydrated, Walker dazzles

A look at the highlights of what's happening all around spring training in Florida and Arizona today:



Red Sox slugger David Ortiz won't be in the lineup against Toronto. The Boston designated hitter is out for at least a couple of days because of dehydration.


Prized Mariners youngster Taijuan Walker starts for the fourth time this spring, facing Cleveland. The 22-year-old righty has given up just two hits in eight shutout innings so far.


Edwin Jackson makes his third exhibition start for the Cubs, vs. Arizona. He's been so-so this month, and Chicago hopes to get more this season after he went 6-15 with a 6.33 ERA last year.


Baltimore infielder Ryan Flaherty is OK to play against Pittsburgh. He was hit in the helmet this week by a pitch from Minnesota's Brian Duensing, and has passed tests for concussion symptoms.

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