The San Diego Padres are stocking up on outfielders. The Padres have agreed to a trade with the Atlanta Braves for outfielder Justin Upton, according to multiple reports. San Diego already acquired outfielders Matt Kemp and Wil Myers this week before landing Upton. The Braves will acquire left-hander Max Fried, second baseman Jace Peterson, third baseman Dustin Peterson and outfielder Mallex Smith, according to CBSSports.com’s Jon Heyman. The Padres reportedly will acquire a lower-level prospect in addition to Upton. The Padres entered this offseason in need of some offensive firepower, particularly in the outfield. Now, they have a surplus of outfielders, creating the potential for even more moves this winter. Upton, who was