The Dodgers optioned struggling rookie outfielder Matt Kemp to Triple-A Las Vegas on Friday to make room for outfielder Ricky Ledee, who was activated from the 60-day disabled list. Kemp, 21, made the jump from Double-A on May 28. He was batting .279 with seven home runs and 21 RBIs, but had only two hits in his last 15 at-bats.