Brown had a .650 OPS from the 2013 All-Star break through this season, which ranked 289th out of 339 qualified hitters in baseball, and 16th lowest among 133 outfielders. That, combined with the emergence of other outfielders in the system and his second year of salary-arbitration eligibility, made his departure a certainty. Brown has the right to decline an assignment to the Minor Leagues and become a free agent, which is expected.
"It just didn't work out," Phillies interim general manager Scott Proefrock said. "We've decided we've got players who deserve the playing time more than Domonic does."
The Phillies also outrighted prospects Tommy Joseph and Kelly Dugan and outfielder Brian Bogusevic. The Phillies acquired Joseph in July 2012 from the Giants in the Hunter Pence trade, but concussions derailed a promising catching career. Joseph, who remains under the Phillies' control next season, moved to first base this year, and the Phillies remain hopeful he can produce enough offensively to become an option at first base in the future.
"There's an opportunity here, if he can swing the bat and play the position," Proefrock said. "We don't really have a first baseman at the upper levels."
Dugan, the Phillies' top pick in the 2009 Draft, had been saddled with injuries and was passed on the depth chart by other outfielders. He can become a Minor League free agent five days after the World Series. Bogusevic, like Brown, can immediately become a free agent.
Brown's exodus is the most notable of the Phillies' latest roster purge. Just a few years ago, the Phillies believed they had a superstar in the making in the 20th-round selection in the 2006 Draft. But other than a strong first half in 2013, Brown never lived up to the hype.
He was ranked No. 4 among all prospects in 2011. Two of the three players ranked ahead of him were the Angels' Mike Trout (No. 1) and the Nationals' Bryce Harper (No. 3).
Monday's announcement follows another two weeks ago when they outrighted right-hander Justin De Fratus, infielder Chase d'Arnaud, outfielder Jordan Danks, catcher Erik Kratz and left-handers Adam Loewen and Ken Roberts. Right-hander Jonathan Pettibone also was outrighted after being activated from the 60-day disabled list.
Todd Zolecki is a reporter for MLB.com. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.