After spending seven seasons in the Toronto minor league system, Borders made the big club in 1988. He was their starting catcher for the 1992-93 seasons, in which they won back-to-back World Series championships.

His bat was never his strong point but he took it up a notch in October, hitting .318 in the '92 World Series, and .304 in the Series the next year.

After a disappointing performance for the Blue Jays in 1994, he began a free-agency tour of the majors, landing with the Royals, Astros, White Sox, Indians, and played the 2001-02 seasons with the Mariners.