Like it says in the article:
A spinning ball (with a rough surface - dimples) will create lift through different pressures on either side of the ball.

The direction of the lift force is related to the direction of the spin, and lift can be up or down or right or left or other logical combinations.

If you want a physics paper that I have on the Magnus Effect, then PM me with your email address and I will send it to you. (I don't want to break any copywright laws.)

If you want more I will start a different thread, but be forewarned it would probably be excessively technical.

Charles