The players are divided into two teams, and line up behind the baseline (one line on the ad, one on the deuce side), ready to serve.
Each team has 3 cones next to them; the basket of balls is placed just behind the baseline center, between the two teams (see graphic below).

Drill:
Players, in each team, take turns one at a time, serving one ball. 
For every serve in, the respective team scores 1 point. 
As soon as one of the teams scores 10 points, the last player to serve the ball in will take the 3 cones and place them randomly inside the service box the team was aiming for.
From that point on, as soon as a player hits any of the 3 targets, their team wins the game; this time, the other team will try to catch up and place their cones inside the service box and knock a cone before their opponents.
Once the game is over, the teams switch sides and play again.

Note: 
This is a fun competitive serving game that can be played by beginning, as well as advanced players.