I was looking at Asahi's article on the recent soccer game, and I'm a bit confused by something. It says 日本、PKで豪破り、4強 サッカーアジア杯. My problem regards the 4強. I can only interpret this as meaning "more than 4," but I don't know what that could be in reference to. At least that's the only meaning I know for 数字+強, but now I'm wondering if it might mean that Japan won by a score of 4 to something.
Incidentally, Sankei also uses that phrasing. Their headline is 日本、PK戦制し4強進出 サッカー・アジア杯準々決勝. I assume the meaning is the same, whatever that meaning happens to be.