A ball-launching system mounts to a top rim of a roulette wheel and positions a ball launcher configured to launch a roulette ball into the roulette wheel. The ball-launching system includes an outer jaw and an inner jaw, which clamp to the top rim. At least a part of a ball launcher extends into a concave bowl of the roulette wheel and facilitates launching the roulette ball directly into a ball track underneath the top rim within the concave bowl.