As both a Rams and a Huskers fan, it pains me to bring up this classic example, but I give you Jim Everett and the Phantom Sack....
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The Rams and 49ers were neck and neck in the late 80s, but the 49ers always won in the playoffs when it mattered. Jim Everett was on a path to be a Hall of Fame QB,... and then that happened. He was never the same. The Rams O-line had been the best in the NFL for most of the 80s, and they didn't suddenly become awful, but they aged and wore down, and suddenly Jim Everett's sky-high passing numbers took a nosedive that gave the Hindenburg a challenge for the title of "Most Fiery Nosedive Crash."