What racket sport can be played with four balls of differing bouncing qualities?

Question

Name the only sport in which the ball is always in possession of the team on defense, and the offensive team can score without touching the ball?

Answer 1

Squash is the racket sport can be played with five balls of differing bouncing qualities.(its five not four)
The Five balls are
Orange - Super Slow / Super Low
Yellow - Super Slow / Low
Green or White - Slow / Average
Red - Medium / High
Blue - Fast / Very High