This opening for NBC's telecast of the 1986 World Series aired on 10/15/86.
The announcer is (do I even need tell you?) Vin Scully.
The music is called "Heroes" and it's from the Universal Production Music album "Winners. The track is catalog number MAT103-3. The full version can be heard here:
https://www.youtube.com/watch?v=bvEBYkbDFWw