Here's another: Borg made his first serve on 4 of 4 break points in the 1979 RG final against Pecci.
That's kind of a mixed case because Borg normally hit big first serves, but on that occasion he was spinning them in.
In the '80 W final it was a different story. At 4-all in the second set he faced 3 break points, all potentially giving McEnroe a chance at a two-set lead. Borg put 3 strong serves in the box and drew return errors on all of them.