Portugal have risen to third and Colombia are now South America's top-ranked nation after Argentina slid three places in the latest FIFA ranking.
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World champions Spain remain top and Germany stay second in April's standing, with Copa America holders Uruguay climbing one place to fifth.
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Argentina are now joint-sixth with this year's World Cup hosts Brazil, who have risen three places.
Though no top-10 team played last month, the movement in the ranking was caused by earlier results in a four-year cycle of matches decreasing in value.
Switzerland, Italy and Greece complete the top 10, with the latter returning there for the first time since October 2012.
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England have risen one place to 11th, while the United States climbed to 13th after drawing 2-2 with Mexico in a friendly on April 2. El Tri moved up one place to 19th as a result of that draw.
Scotland were the biggest climbers, soaring 15 places up to 22nd.
Ivory Coast, at No. 21, lead the African nations, while Iran are the highest-ranked Asian confederation team at No. 37.
Australia, at No. 59, are the lowest-ranked team at the World Cup, which kicks off in Sao Paulo in June 12.
Information from the Associated Press was used in this report