noun
In card games, the highest or lowest card depending on the game.
ポーカーでエースが一番強いカードだ。
In poker, the ace is the strongest card.
Refers to the best player on a team, especially in sports like baseball, or more broadly to an outstanding person in any field.
彼はチームのエースとして活躍している。
He is performing well as the ace of the team.
営業部のエースが今月もトップの成績を収めた。
The ace of the sales department achieved the top results again this month.
noun
In tennis and similar sports, a serve that the opponent cannot return. Often referred to as サービスエース.
See also: サービスエース
彼は試合で10本のエースを決めた。
He hit 10 aces in the match.