Jay Mariotti, the opinionated and polarizing sports columnist for the Chicago Sun-Times, told the Chicago Tribune he resigned on Tuesday after 17 years with the paper.

Just back from Beijing where he wrote about the Summer Olympics, Mariotti said in a phone interview Tuesday night that he decided to quit after it became clear while in China that sports journalism had become "entirely a Web site business. There were not many newspapers there.'' He added that most of the journalists covering the Games were "there writing for Web sites.''

Mariotti, whose public battles with fellow staffers, team owners, and rival columnists are legendary, didn't disclose any specific plans except to say he will continue doing his regular stint on ESPN's "Around the Horn.''