Caleb Ganansky and Jack Drake sat on the side of Tenney Park’s tennis courts on a sunny Wednesday afternoon, catching their breath from their last match. “I am definitely sweating more than I should be,” said Drake, 28. The game was not tennis, though. The two graduate school friends caught up over the fastest-growing sport in America. Your parents likely play it. Your friends, too. Maybe even your grandparents have joined the trend. “Pickleball is humbling,” Ganansky, 28, said.