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:

---

PAPI PAUSE

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.

BRIGHT FUTURE

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.

ACTION JACKSON

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.

CLEARED UP

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.