Dodgers shut out by Sonny Gray and Cardinals for their fourth loss in six games

ST. LOUIS — With much of the Dodgers’ pitching staff spending more time in the trainer’s room than on the field this season, the team has practically launched a shuttle service to ferry arms between triple-A Oklahoma City and the big leagues.

On Friday it deposited left-hander Justin Wrobleski on the mound at Busch Stadium where he failed to give the Dodgers the lift they needed, yielding four runs in six innings of a 5-0 loss to the St. Louis Cardinals.

The lost was the fourth in six games for the struggling Dodgers (38-26), who have dropped 11 of their last 20, scoring just one run combined in their last two defeats.

Wrobleski (1-2), making his second start of the season, gave up six hits, walked three — two of whom scored — and struck out five over six innings. All four runs agai