John Brockington was the first runner in NFL history to rush for 1,000 yards or more in his first three seasons. An explosive, punishing runner at 6-foot-1, 225 pounds, Brockington had gained 3,276 yards by the end of his third year, averaging a healthy 4.3 yards per carry. As a rookie, he gained 1,105 yards, averaged 5.1 per carry and produced a 52-yard touchdown. In 1973, he rushed for a career-high 1,144 yards with a 4.3 average. “Rated one of the greatest running backs in pro football history after only three seasons,” his bio in the Packers’ 1974 media guide began.