Try this website: http://www.winchestermass.org/rules.html#R7
According to the USTA's 2009 "Friend at Court" rule book (refer to the link, below), there are a number of ways that a serve may be considered "illegal":
Foot faults
(i.e., on or over the singles line for singles, and the doubles line for doubles)
Non-foot faults
Sports where you serve a ball include tennis, volleyball, badminton, table tennis, and pickleball. In tennis, the serve starts each point, while in volleyball, the serve initiates play and is crucial for scoring. Badminton and table tennis also require a serve to start each rally, and in pickleball, the serve is used to begin each point as well.
In a game of tennis, you serve from behind the baseline on the right side of the court.
Considering that the purpose of a URL is to serve as an "address" for a resource, a URL is invalid when it does not identify an existing resource.
Badly.
a serve
You can hit an underhand serve in tennis; however, the overhand serve is more effective because it is more powerful. That is why you don't see the underhand serve used much.
In tennis, you serve the ball from behind the baseline into the diagonally opposite service box on the other side of the net.
A tennis ball!
Let
A tennis ball.
Yes
a serve