Pakistan captain Inzamam-ul-Haq said his side are still searching for a winning batting blend after their 54-run defeat to West Indies.
Pakistan skipper Inzamam-ul-Haq made 36 from 65 balls
Pakistan were dismissed for 187 chasing the hosts' 241-9 in the World Cup Group D opener at Sabina Park, Jamaica.
Inzamam said: "We have tried all the combinations and we have not been successful. Hopefully in the coming matches the top order does better.
"There is some pressure on us now, but we have experienced batting."
Inzamam won the toss and put West Indies into bat, and the hosts looked to be 20-30 runs short on a decent batting wicket.
But Pakistan's top order showed little resistance against some accurate, penetrative bowling from the unheralded West Indies seamers.
Inzamam, who made a painstaking 36 from 65 balls, added: "On this track, 241 is not a big total, but credit goes to the West Indies fast bowlers, they really bowled well.
"Hopefully Danish Kaneria [who took 1-45] will continue his form and his luck will come in the coming matches. The bowlers are all working hard in the nets."
Pakistan face Ireland on Saturday and Zimbabwe next Wednesday, knowing a slip-up could see them crash out of the event.
Even if they win both matches, they will face an uphill task in the Super 8 phase because group points are over carried over.