Sook - when the clubs look to sign a top draft pick they may bring them in to do a physical, they may address various concerns that they may have and any medical records you may have from previous concerns.
There are a couple of top 10 round draft picks this year that may have lost big money due to current or previous injuries and questions on their long term physical health.
Here is an example of a player having to do a physical (he was fine) before finalizing his big money signing:
http://collegebaseball.rivals.com/content.asp?CID=838444Here is another example of a physical:
HOUSTON -- Indications, including a published report, are that the Giants are nearing an agreement with catcher Buster Posey, their No. 1 selection in June's First-Year Player Draft, before Friday's 9 p.m. PT deadline.
Though no formal announcement was scheduled by the club, the San Jose Mercury News reported that Posey will receive a bonus of approximately $7.5 million.
According to other published reports, Posey recently checked into the Giants' training facility in Scottsdale, Ariz., to undergo a physical, another sign an agreement could be forthcoming.