About eight days after winning the 1991 PGA Championship, John Daly landed on the cover of Sports Illustrated. The August 19, 1991, issue billed him as “Long Shot: Big hitter John Daly in a big PGA upset.” But if the past was any guide, even that cover moment would have seemed unlikely without the wild, whirlwind week that came before it. Daly was the ninth alternate in line to play the PGA Championship that year, so his chances of cracking the …