No. 3: Mick Tingelhoff
Former Nebraska center Mick Tingelhoff actually began his professional career before the NFL/AFL merger. What's more, he was an undrafted player in 1962 after being just a one-year starter in Lincoln.
After signing with the Minnesota Vikings, he started as a rookie and held that job down until his retirement in 1978. He was a first-team All-Pro selection five times in his career (1964-66, 1968, 1969). He was also a second-team All-Pro in 1967.
A six-time Pro Bowl player from 1964-69, he is on the list of the 50 greatest Minnesota Vikings of all time. He's also in the Vikings Ring of Honor and his No. 53 has been retired by the franchise.
Along the way, Tingelhoff set a record for consecutive starts by an offensive lineman at 240. He was one of 11 players to have played in all four of Minnesota's Super Bowl appearances in the 1970s. Tingelhoff was elected into the Pro Football Hall of Fame in 2015.