I recommend wearing masks whenever you are not on the court. When on the court however, we do not require a mask.
The World Health Organization (WHO) apparently agrees with this. The message below from WHO says wearing a mask while exercising is hazardous to your health.
Please wear a mask and do your best at social distancing when not on court.
This information was passed on to me and the other Ambassadors of the Pickleball Association of Ontario to share with our members.