Herrera, despite making an immediate impact when he finally got the promotion after nine years in the Minor Leagues, has been passed by another newcomer, Luis Cruz. Herrera, batting .305 as recently as June 17, is 9-for-64 (.140) since.
Van Slyke is hitting .167 in two callups with two homers and seven RBIs.
Kemp, who missed nearly two months with a strained left hamstring, had a double, single, groundout and flyout in the Dodgers' 2-1 win over the Padres. Ethier, who missed two weeks with a strained oblique muscle, grounded out, grounded into a double play and was hit by a pitch.