Being in first place or the leading position — the top rank in competitions, rankings, leagues, etc.
我がチームはついに首位に立った。
Our team has finally taken first place.
彼は今シーズン、首位を守り続けている。
He has kept the top position throughout this season.
最終戦で首位争いが決まるだろう。
The final match will likely decide the fight for first place.