[pekim]

Darts might not be considered a sport, but the British Darts Organisation [1] and the Professional Darts Corporation [2] co-existed (somewhat acrimoniously) for nearly 30 years.

[1] https://en.wikipedia.org/wiki/British_Darts_Organisation (BDO)

[2] https://en.wikipedia.org/wiki/Professional_Darts_Corporation (PDC)