At Exhibition Stadium, the Blue Jays beat the Mariners, 10-4, when the two new American League’s teams meet for the first time. Toronto will win their inaugural season series with Seattle, taking six of the ten games against their West Coast rival.

On May 9, 1977 — At Exhibition Stadium, the Blue Jays beat the Mariners, 10-4, when the two new American League’s teams meet for the first time. Toronto will win their inaugural season series with Seattle, taking six of the ten games against their West Coast rival.

Sources:
National Pastime

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