If you say that someone holds all the aces, you mean that they have all the advantages in a contest or situation
of the highest quality; "an ace reporter"; "a crack shot"; "a first-rate golfer"; "a super party"; "played top-notch tennis"; "an athlete in tiptop condition"; "she is absolutely tops
a serve that the receiver is unable to reach one of four playing cards in a deck having a single pip on its face someone who is dazzlingly skilled in any field serve an ace against (someone) play (a hole) in one stroke score an ace against; "He aced his opponents"
An ace is a playing card with a single symbol on it. In most card games, the ace of a particular suit has either the highest or the lowest value of the cards in that suit. the ace of hearts