Ken Sanders, a George Mason University freshman and high school basketball all-America, pleaded guilty yesterday to assaulting his former roommate Feb. 25, was fined $100 and ordered to pay his roommate's $175 hospital and telephone bill.

Sanders did not speak during the two-minute hearing in Fairfax County General District Court at which he entered a guilty plea to a single misdemeanor count of simple assault.

Sanders, a 6-foot-5 forward, stood by as assistant prosecutor Thomas C. Scanlan advised Judge G. William Hammer of a plea agreement whereby Sanders pleaded guilty and Scanlan recommended the $100 fine.

A 30-day jail sentence and an additional $150 fine were suspended by Hammer contingent on Sanders' good behavior.

Sanders, 19, out of McKinley Tech High School in the District, has yet to play college basketball. He transferred to Oklahoma early this year, but returned to Mason after just a few weeks. He is not eligible to play basketball until January.

Sanders was charged with pummeling Steven Kramer, 19. According to Scanlan, Sanders struck Kramer after Kramer refused to turn out a light so Sanders could go to sleep.

Scanlan said there had been disagreements between the roommates for several months prior to the altercation.

Kramer, who was in court yesterday, declined to discuss the incident, but accepted a check for $175 from Sanders' attorney.

Both Sanders and his attorney declined to comment.