seal the game / seal the win ：锁定胜局

seal有封口或者确认的意思。

例：Gomez scored another two goals to seal the win.

经常看体育比赛的应该知道吧

字典上查到的英文解释：(written) to make sth definite, so that it cannot be changed or argued about: to seal a contract / deal

使……明确而不可改变

字典上的例句：

◆ She sealed victory with a birdie at the final hole.

最后一洞，她用一个小鸟球锁定了胜局。（高尔夫比赛中）

win可以作为名词：胜利。

所以翻译成“锁定胜局”最为合适。