No
National Football League team showed interest in the undersized center, who weighed only 205 pounds. After he signed with the Raiders, he played there for the entire 10 years of the league's existence and five years beyond that after the merger of the NFL and AFL. Otto wore the jersey number 50 in his rookie season, but the suggestion of equipment manager Frank Hinek led to the idea of Otto wearing 00 (0 was being worn in the NFL by
Johnny Olszewski) "for recognition", which Otto eventually went with, as did AFL Commissioner
Joe Foss. For the next 15 years, Otto was a fixture at center for the Raiders, never missing a single game due to injury, and played in 210 consecutive games. He won one AFL/AFC championship in
1967 against the
Houston Oilers with the Raiders, but lost five: in
1968,
1969,
1970,
1973, and
1974 to the
New York Jets,
Kansas City Chiefs,
Baltimore Colts,
Miami Dolphins, and
Pittsburgh Steelers, respectively, with all five teams winning the
Super Bowl. He played alongside
Gene Upshaw, another Hall of Famer, at left guard from 1967 to 1974. In the 1967 regular season, Oakland scored 468 points (33.4 points/game), leading the AFL, but lost
Super Bowl II to the
Green Bay Packers. In
1968, Oakland scored 453 points (32.4 points/game) in the regular season, again leading the AFL, and beat the
Chiefs in the
divisional round (unscheduled
tiebreaker), 41–6, before losing to the Jets, 27–23. In the
1969 regular season, Oakland scored 377 points (26.9 points/game) to lead the AFL for the third consecutive year, and beat the
Houston Oilers in the new
divisional round of the AFL playoffs, 56–7, before losing to the Chiefs, 17–7, in the final
AFL Championship Game. In the
1970 regular season, the first year of the
NFL-AFL merger, Oakland scored 300 points (21.4 points/game), ranking ninth in the 26-team NFL, and beat the
Miami Dolphins in the
AFC playoffs, 21–14, before losing to the
Baltimore Colts in the
AFL Championship Game, 27–17. The Raiders missed the playoffs for the first time in five years in
1971, despite scoring 344 points (24.6 points/game), second highest in the NFL. The Raiders came back stronger in
1972, scoring 365 points (26.1 points/game), ranking third in the NFL, but lost 13–7 to the
Pittsburgh Steelers in the divisional round of the
AFC playoffs. The game became famous as the
Immaculate Reception game, in which Otto also made the only pass reception of his professional career. Otto claimed he had a close and clear view of the immaculate reception play involving the Raiders'
Jack Tatum hitting the Steelers' receiver
John "Frenchy" Fuqua with the ball floating into the hands of the Steelers'
Franco Harris who scored the game-winning touchdown with less than one minute to play. Otto had no doubt that the pass should have been deemed incomplete under the then current NFL rules, and the Raiders should have won the game. During the 15-minute delay while the officials determined how they were going to call the play, Otto feared for his safety from inebriated Steeler fans if the call went against the Steelers, and plotted how he would escape the fans should they have rushed onto the field. The outcome disturbed Otto for years, though he did not bear the Steelers' players any ill-will. In the
1973 regular season, Oakland scored 292 points (20.9 points/game), tenth in the NFL, and avenged their defeat to the
Steelers, 33–14 in the division round of the 1973 playoffs, but lost to the Dolphins in the
AFC Championship Game, 27–10. In Otto's final year,
1974, Oakland scored 355 points (25.4 points/game), leading the NFL, and avenged their playoff loss to the Dolphins in the divisional round, 28–26, but lost to the Steelers again in the
AFC Championship Game, 24–13. During the last three years of his career with the Raiders, he would have his knee injected with
xylocaine and drained three times a week with a long syringe. Before games on Sunday, he would have his knee braced and would take
Darvon before playing each game. He had a bone graft before coming to training camp in 1975, but it failed after 2½ weeks. == Legacy and honors ==