YOU SAID:

He is strong, but he can't win against the next guy even he uses his Thai style boxing.

INTO JAPANESE

彼は強いが、タイスタイルのボクシングを使っても次の相手には勝てない。

BACK INTO ENGLISH

He's strong, but even using Thai-style boxing, he won't be able to beat his next opponent.

INTO JAPANESE

彼は強いが、タイ式ボクシングを使っても次の相手には勝てないだろう。

BACK INTO ENGLISH

He's strong, but even with Thai boxing he won't be able to beat his next opponent.

INTO JAPANESE

彼は強いが、タイボクシングでさえ次の相手に勝つことはできないだろう。

BACK INTO ENGLISH

He's strong, but I doubt he'll be able to beat his next opponent, even in Thai boxing.

INTO JAPANESE

彼は強いが、タイボクシングでさえ次の対戦相手に勝てるかどうかは疑問だ。

BACK INTO ENGLISH

He's strong, but it's questionable whether he can beat his next opponent, even in Thai boxing.

INTO JAPANESE

彼は強いが、タイボクシングであっても次の相手に勝てるかどうかは疑問だ。

BACK INTO ENGLISH

He's strong, but it's questionable whether he can beat his next opponent, even in Thai boxing.