Basically any player on the opposing team! Cristiano Ronaldo isn't a favourite with opposing fans, but Robbie Savage has had a lot of abuse through out his career.
Ndamukong Suh from the Detroit Lions is the most hated player in the NFL.
scalabrine is by far the most hated player on the celtics.
Celtic football club
real madrid
Manchester United
Right now the most hated player is Alex Rodriguez of the yankees.
1986 University of Miami football.
There are 2 Most Hated players for Arsenal, and they are William Gallas and Emmanuel Adebayor.
Joey Barton of QPR
Philadelphia Flyers, they play dirty but, in a bad way.
LeBron James
The football player who holds the record for the most hat tricks in football history is Lionel Messi.