BRIDGETOWN (AFP) - Graeme Swann has admitted that Ramnaresh Sarwan has become a thorn in England's side after the West Indies batsman struck his third hundred of their Test series on Saturday. Sarwan's marathon, undefeated 184 followed scores of 107, 94, and 106 in his three previous innings in the series, and has enhanced West Indies' chances of saving the fourth Test at Kensington Oval. Sarwan's 14th Test hundred carried West Indies to 398 for five, replying to England's first innings total of 600 for six declared, at the close on the third day - leaving the home team three runs short of avoiding the follow-on. "He has been a pain in the backside for us in the series so far," Swann said. "We need to come up with a method for dislodging him. "He has been good enough to get a hundred and get out in the previous three knocks, but (on Saturday), he carried on after he got the milestone and he has been hard to get out. "He must be due a low score at some stage, so let's hope it is in the second innings of this Test." This may be wishful thinking on Swann's part because Sarwan believes that West Indies have not yet reached the threshold of safety. "I do not think we have reached safe waters just yet," he said. "There is still a lot of time to go. There is two days left in the match. "(On Sunday) we have to try and continue from where we left off. Denesh (Ramdin) and I seem to be going pretty well, so we just want to continue to build that partnership." "Our aim right now is to get way past 400, whether I get a double-hundred or not. I just want to bat for as long as possible, and continue to form partnership with the batsmen to come." Sarwan shared four significant partnerships that boosted the West Indies. He added 108 for the second wicket with Devon Smith, 122 for the fourth wicket with compatriot Shivnarine Chanderpaul, 53 for the fifth wicket with Brendan Nash, and 64 - unbroken - with Ramdin. "I think it is a matter of us forming partnerships," he said. "This is what we have been concentrating on doing in this series. "I think we did it (this time) quite consistently. After Shiv got out, Brendan came in and we got a 50 partnership, and then another with Denesh. "This is what we have been trying to do for a long time - form partnerships - and it worked." Sarwan is clearly in the form of his life, and seems unwilling to accept any labelling of him as a star batsman. "It is one of my better knocks, but I don't want to get carried away," he said. "I still have a lot of cricket to be played in my career. "I just want to take it step by step, and this is just another stepping stone, and hopefully, one day when I retire, things will fall into place. I do not want to look too far ahead