sure winner

必胜的人或事物：指在某种情况下肯定会获胜或成功的人或事物。
常用释义
必胜的人或事物：指在某种情况下肯定会获胜或成功的人或事物。

例句

Make full preparations in advance to be a sure winner in a war.

尽量事前做好准备，打有把握的仗

on the other hand , being unable to stay in a zone can turn a sure winner into an also ran.

反之，不能进入状态并持续下去，就很可能使本来稳胜算的人终于失败。