While he was an undergraduate, Koch played for coach Buster Bishop's Florida Gators men's golf team in National Collegiate Athletic Association (NCAA) competition from 1971 to 1974.

His career year in professional golf came in 1984 when he finished seventeenth on the money list and captured two titles: the Isuzu-Andy Williams San Diego Open and the Bay Hill Classic.

A long-time member of the NBC Sports announcing team (1996–present), he is best known for his "Better than Most"[7] call in the third round of the 2001 Players Championship at the TPC at Sawgrass.

Three down from leader Jerry Kelly, Tiger Woods was facing a long, triple-breaking, fringe putt for birdie on the 17th hole's famous Island Green.

Koch's call of that putt has gone down as one of the most famous in golf history as it was during the height of Tiger's dominance, on an iconic hole of a well-known course, on the way to an inevitable, yet routine Woods comeback to win the tournament.

[9] this list may be incomplete *Note: The 1988 Panasonic Las Vegas Invitational was shortened to 72 holes due to weather.