In/According to the FIFA rankings, Japan is ranked 61 in the world so...
At this year's World Cup, I didn' t expect Japan to play as well as they did because according to FIFA, they (we!) are ranked 61st in the world.
「日本はFIFAランキング61位ですから」= Japan is 61st in the FIFA rankings so... / In (又はaccording to) the FIFA rankings, Japan is ranked 61 in the world so...
「今回サッカーワールドカップでは、FIFAランク61位の日本に、こんな良い試合を見れてもらえるとは思わなかった。」 = At this year's World Cup, I didn' t expect Japan to play as well as they did because according to FIFA, they (we!) are ranked 61st in the world.
ボキャブラリー
according to = ~によると
at this year's World Cup = 今年のワールド・カップでは
didn't expect = ~になると思わなかった・期待しなかった
play well = 良い試合を見せる
because = なぜなら