ORLANDO, Fla. --- Baseball wants to prevent another tragic accident like the one that killed Mike Coolbaugh .
General managers decided Thursday that first- and third-base coaches will wear some sort of head protection next season, a move that came four months after Coolbaugh was struck in the neck by a line drive during a minor league game.
Coolbaugh, a former major league player, was a coach for the Colorado Rockies' Double-A team in Tulsa when he died July 22. He had been hit by a liner as he stood in the first-base coach's box during a Texas League game at Arkansas.
Some major league coaches responded by wearing helmets the rest of the season.
ON THE BALLOT: Billy Martin, Marvin Miller and Doug Harvey are among 20 former managers, executives and umpires on the new Hall of Fame ballots to be considered by the revamped Veterans Committee when it votes next month.
Whitey Herzog, Davey Johnson, Gene Mauch and Bowie Kuhn are other notable candidates up for induction in 2008.
NATIONALS: Third baseman Ryan Zimmerman had surgery to remove a broken piece of bone from his left wrist and should be able to begin light rehab in about a week. He is expected to fully recover in four to six weeks.