EXCLUSIVE CONTENT Get ESPN+ Ranking every NBA playoff series by upset potentialKevin Pelton ranks all eight NBA first-round playoff series by upset potential. AP Photo/Tony DejakKevin Pelton, ESPN Senior WriterApr 14, 2016, 01:00 PMClose Co-author, Pro Basketball Prospectus series Formerly a consultant with the Indiana Pacers Developed WARP rating and SCHOENE systemFollow on XEmailUpsets do happen every year, even in the NBA.