What is aces in tennis?

In tennis, an ace is a serve that is not touched by the opponent and thus results in a point for the server. Aces are usually served with great speed and accuracy, making them difficult to return. The term "ace" comes from the deck of cards, where the ace is the highest card. In tennis, a player's ability to serve aces is considered an important weapon in their arsenal as it can help them win points easily without having to engage in lengthy rallies. Some players are particularly known for their ace-serving ability, such as Roger Federer, Pete Sampras, and Goran Ivanisevic. In professional tennis, aces are often tracked as a statistic, and records are kept for most aces served in a single match, tournament, or career.