as Wales target a first victory since they beat the Barbarians more than five months ago. "I have huge respect for teams like Samoa. They are big, physical guys and they are really good rugby players," Roberts added. "We have played against them a few times in the last four or five years, and in 2009 they would have won if they had not dropped the ball over the line in the last minute. "And I remember the match in the World Cup last year, which was probably one of the toughest matches of my career. "You have to match these sides physically to have any chance of competing. "We have to be less tactically nave than we were on Saturday, when we did not play in the right areas. "We played too much rugby in our own half and on halfway, and we cannot afford to do that against Samoa. We also have to get our defensive structure right. "We have to be on the money from the start of the game, which we were not last Saturday."