In 1977, Ryan began working at CBS. There Ryan called games for the "NBA on CBS" from 1977–1983, "NFL on CBS" from 1977–1993, "College Football on CBS" from 1996–97, and college basketball from 1982–1998. He also called alpine skiing at the 1992, 1994 and 1998 Olympic Winter Games. From 1978–97, Ryan was a CBS tennis commentator. He called nineteen U.S. Open Tennis Championships.