Watson , an eight - time major champion , would never win a PGA Championship to complete the career Grand Slam .
John Mahaffey wins the PGA Championship in a playoff , after Tom Watson lets slip a five - shot lead during the final day .
Tom Watson , an eight - time major Tom Watson , would never win a PGA Championship to complete the career Grand Slam .
John Mahaffey wins the PGA Championship in a playoff , after Tom Watson lets slip a five - shot lead during the final day .