Grab the ball from center court and jump through the enemy hoop by using a rocket jump, or a grenade jump, or a concussion jump. Use grenades to knock enemies away from the hoop, but be precise, as projectiles (rockets, grenades) that one might use splash damage for go through the backboard.

Some playing tips? Make good use of the C key. You can use this key to throw the ball any where you aim. However, the ball tends to arch very high, so aim a fair bit lower than where you intend the ball to end up. If you're on the enemy side of the court and feel death is iminent, then aim toward your end and throw the ball. That way, a team mate (yourself, too, if you respawn fast enough) can retrieve the ball and try again. This throw, should be a desperate one. You should try passing the ball to your team mates before deciding to toss it down court at your spawn.

As a Medic, overcharge as many team mates as possible before the round begins, so that they may have enough health to rocket jump into the enemy hoop. When someone enters your end of the court and is heading for the net, you should prime any grenade and get ready to throw it up at them to knock them away or possibly kill them. The Medic, with three concussion grenades, makes a good defense.

Please report any problems on the forums.
Have fun.