Is it pickle ball or pickleball?
According to Merriam-Webster’s dictionary the word “pickleball” is a single word spelled as you see here with no capitalization unless it is the first word in a sentence.
Much like baseball and basketball, pickleball is the name of the sport.
Merriam-Webster’s diction defines pickleball as:
“an indoor or outdoor game that is played on a level court with short-handled paddles and a perforated plastic ball volleyed over a low net by two players or pairs of players”