This all depends on what u define as "arrogant". When Hingis was on the scene she was the most arrogant, but it was never seen as such, she was considered "fiesty". Jennifer was arrogant in many ways, but she was considered "Americas Bad Girl" so this was ok. Serena and Venus came on the scene with a lot of confidence and they were considered "arrogant" and a list of other names!(most of which can be found in threads on this board!) I think the most arrogant was Martina Hingis, and Jennifer Capriati, because their arrogance was blatant towards other players!
".. IF U WANT TO BE PROFOUND! IF U REALLY NEED TO JUSTIFY! TAKE A BREATH AND LOOK AROUND..A LOT OF FOLKS DESERVE TO DIE!!"-AUDREY II