On April 15, 1990, ESPN's "Sunday Night Baseball" debuted with the experienced play-by-play announcer Jon Miller joining retired Hall of Fame player Joe Morgan in the broadcast booth. In its first year, "Sunday Night Baseball" averaged a 3.0 rating. That was double the number that ESPN as a whole was averaging at the time (1.5). By 1998, ESPN enjoyed its largest baseball audience ever (a 9.5 Nielsen rating) as Mark McGwire hit his 61st home run of the season. When ESPN first broadcast "Sunday Night Baseball", they would show at least one game from every ballpark. Also, every team was guaranteed an appearance. It was essentially, the television equivalent to a cross country stadium tour.