Of the players who are playing in this tournament, five have already scored more than 100 points.
There are five players in this tournament who already have more than 100 points.
「〜の中で」の英訳の一つは「Of (all) the〜」です。
Of all the dogs I've met, Pochi is my favorite.
あったことある犬の中で、ポチちゃんが私の一番好きな犬だ。
でも、そんな長い文書はいらないと思って、例文2で簡単に「There are 〜 in this tournament who 〜」にしました。
違う例文:
東京にあるラーメン屋さんの中で、こういうラーメンを出しているのは三つだけあります。
Of all the ramen shops in Tokyo, there are only three that serve this kind of ramen.
There are only three ramen shops in Tokyo that serve this kind of ramen.