the world no 1 recovered from a shaky start to card a one-under-par 71 but finished seven shots behind first-round leader jordan spieth .
mcilroy must hope for the early runners to drop shots as he 's scheduled to go out in the penultimate group with phil mickelson and ryan moore at 6.48 pm -lrb- bst -rrb- on friday .
rory mcilroy and phil mickelson , right , go out in the penultimate group on friday .