Served!

Riddle: What is served, but not by a waiter; and an ace but not a card?

Answer: A volleyball: serving is a classic volleyball move, and a serve that drops without the opposing team touching it is called an ace.

Source: https://www.riddles.com/5179

Riddle: What is served, but not by a waiter; and an ace but not a card? Answer: A volleyball: serving is a classic volleyball move, and a serve that drops without the opposing team touching it is called an ace. — by RavenclawAli v1.

Riddle: What is served, but not by a waiter; and an ace but not a card? Answer: A volleyball: serving is a classic volleyball move, and a serve that drops without the opposing team touching it is called an ace. — by RavenclawAli v2.