Brown, the starting shooting guard for the Phoenix College basketball team, and big-swinging first baseman Chris Walston, a product of El Capitan High School in Lakeside, join the group initially signed on Monday.
Brown, 23, played parts of four seasons in the Kansas City Royals' organization after being selected in the eighth round out of high school in 2001.
The six-foot four-inch right-hander is an intriguing talent. In 168 innings of work in the low minors, Brown struck out 158, but inconsistent mechanics also led to 135 walks and a 5.01 ERA.
"He's very athletic," said Padre minor league coordinator Bill Bryk. "He's just a thrower now, but he has something to work with."
Walston, 21, adds another power bat to the mix at first base in the lower end of the system. Originally a sixth-round pick by the Angels in 2002, he impressed by launching several tape measure shots in batting practice, and one in a game Saturday.
"He has as much raw power as anyone I've ever seen," said Bryk. "He reminds me of Dave Kingman, just a big guy with monster power."
Unfortunately for Walston, that comparison also extends to his high strikeout totals and low batting average in four years with the Angels' farm clubs.
"He's a work in progress," said Bryk. "But, I'd rather take a chance that he's made adjustments than have him show up somewhere else when we had him in our back yard."