Lleyton Hewitt

Tennis player Lleyton Hewitt is one of the most hated person in tennis. People hate him because while serving in the third set against American James Blake, Hewitt was called for multiple foot faults by a black linesman. After he approached the chair umpire and, pointing first to the offending linesman and then to Blake, said, “Look at him and you tell me what the similarity is.” It was a racial comment and he hasn't been respected since.

Also in his 2005 Australian Open match against Argentine Juan Ignacio Chela, Hewitt was so enraged by Chela's frenzied celebration of an unforced error that he fired a serve directly at him, then spat at him during a changeover.

Hewitt isn’t even popular in his native Australia. He has been booed in his hometown, and after the incident with Chela, one Australian paper proclaimed, “Many regretted [the spit] did not find its target.”