Watch: Jack Nicklaus picks Ohio State on College GameDay

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Golf's greatest champion, Jack Nicklaus, was back at his alma mater Saturday to watch the big game between No. 6 Ohio State and No. 2 Penn State.

Nicklaus was the guest picker for ESPN's College GameDay, and didn't hesitate when making his selection between the Buckeyes and Nittany Lions.

"Are you kidding me? O-H-I-O," said the 77-year-old golf legend.

Nicklaus grew up in the Columbus suburb of Upper Arlington, and attended Ohio State from 1957-1961, before winning 73 PGA Tour titles and 18 major championships.