But some players came into the Open after having used different balls at other tournaments.

It's a different ball, but the best time to make a change is when you're playing well.

It's just time for a different ball to set them off.

But if both teams agree then the game can be played with a different coloured ball.

If you want a more level playing field, give the pro's a different (shorter) ball.

Now they are talking about a whole different ball of wax.

Some leagues even use different balls for male and female batters.

"But in training, I throw different balls, not just the javelin."

The results of your experiment told you how the different balls rolled.

If so, then if you test, say five different 6-lb balls, they should all roll the same way.