Cleveland began the season with a win against the Philadelphia Eagles, who had won the previous two NFL championships. The Browns proceeded to win all but two of their regular-season games, both losses coming against the New York Giants. Cleveland ended the season with a 10–2 win–loss record, tied with the Giants for first place in the American Conference. The tie forced a playoff that the Browns won, 8–3. Los Angeles, meanwhile, finished the season 9–3, tied with the Chicago Bears for first place in the National Conference. The Rams won their playoff, setting up the championship matchup with the Browns.
The game began with a long touchdown pass from Rams quarterback Bob Waterfield to Glenn Davis on the first play from scrimmage, giving Los Angeles an early lead. Cleveland tied the game later in the first quarter with a touchdown from Graham to Dub Jones, but the Rams quickly went ahead again on a Dick Hoerner touchdown run. Cleveland scored two unanswered touchdowns in the second and third quarters, retaking a 20–14 lead. A pair of Rams touchdowns in the third quarter, however, gave Los Angeles a two-possession advantage going into the final period. Cleveland responded with a diving touchdown catch by Rex Bumgardner in the final minutes of the game, followed by a field goal by placekickerLou Groza with 28 seconds left to win 30–28.
Lavelli set a championship-game record with 11 receptions, and Waterfield's 82-yard pass to Davis on the first play of the game was then the longest scoring play in championship history. Los Angeles had 407 total yards to Cleveland's 373, but Cleveland had five interceptions, compared to just one for the Rams. The Browns' Warren Lahr had two interceptions in the game. NFL commissioner Bert Bell called Cleveland "the greatest team ever to play football" after the game.
Before the 1950 season, the NFL added three teams from the All-America Football Conference (AAFC), a competing league that went out of business as part of a peace deal negotiated in 1949. After the addition of the Cleveland Browns, the Baltimore Colts and San Francisco 49ers, the NFL reorganized its Eastern and Western divisional structure into the American and National conferences. The Browns were placed in the American Conference with a group of teams mostly from the old Eastern Division, while the 49ers and Colts went into the National Conference with teams from the old Western Division. Under NFL rules at the time, the teams with the best records in each conference after the 12-game regular season were to play each other in the NFL championship to determine the winner of the league.
The 1950 season ended with ties for first place in both the American and National conferences, forcing two playoff games for spots in the championship. The Browns tied with the New York Giants for the best record in the American Conference, while the Los Angeles Rams and Chicago Bears tied atop the National Conference. It was the first time in league history that both of the NFL's divisions ended in a tie for first place. The Browns defeated the Giants 8–3 in their playoff, and the Rams beat the Bears 24–20 to set up a Rams-Browns championship.
The Browns had been the AAFC's most dominant team, winning all four of its championships between its founding in 1946 and 1949 under head coach Paul Brown. The team, however, was seen by some NFL owners and sportswriters as merely the best squad in an inferior league. NFL commissioner Bert Bell scheduled a matchup between the Browns and the two-time defending champion Philadelphia Eagles in the first game of the season, played a day before the league's other games. A crowd of 71,237 people saw the game, an attendance record in Philadelphia and the ninth-largest in professional football history at the time. After Cleveland won the game, NFL commissioner Bert Bell named Browns quarterback Otto Graham the game's most valuable player and gave him a trophy, calling the Browns "the greatest team to ever play the game".
Cleveland lost for the first time in the third week of the season against the Giants. That was followed by victories over the Chicago Cardinals and Pittsburgh Steelers, but Cleveland lost again to the Giants in the sixth week of the season. The team proceeded to win all of its remaining games, however, thanks in large part to an offense led by Graham, fullbackMarion Motley, endsMac Speedie and Dante Lavelli and tackleplacekickerLou Groza. Cleveland's offense was fourth in the NFL in scoring, with 310 points. The defense, meanwhile, finished second in points allowed, with 144. Cleveland played all of its games against American Conference opponents, aside from one matchup with the Colts in the second week.
Cleveland's record was 10–2 at the end of the regular season, leaving the team tied with the Giants and forcing a playoff to determine the conference winner. The Browns won a coin toss to determine home-field advantage. The game, played in cold weather at Cleveland Stadium, was a low-scoring affair that the Browns won 8–3 on a pair of Groza field goals and a safety.
The Rams began the season with a loss to the Chicago Bears. Victories over the New York Yanks and 49ers followed, but the team fell to 2–2 with a loss to the Eagles in the fourth week of the season. Los Angeles then went on a six-game winning streak that included a 70–27 blowout of the Colts and a 65–24 win over the Detroit Lions. The Rams lost the second-to-last game of the season, again against the Bears, and finished with a 9–3 record. That tied the Rams with the Bears atop the National Conference, forcing a playoff that Los Angeles won, setting up a championship matchup with the Browns in Cleveland.
The Rams averaged 309 passing yards per game, a record that stood until 1984. The team's running unit, led by Dick Hoerner, Vitamin Smith and Dan Towler, averaged more than 140 yards a game. Los Angeles averaged 38.8 points per game in 1950, an NFL record that still stood as of 2007. Los Angeles ended the regular season first in the NFL in points scored, with 466. The team was ninth of 13 teams in points allowed, however, with 309.
While the Rams were unmatched offensively, the Browns' defense gave up half as many points during the regular season. Cleveland coach Paul Brown announced before the game that he would employ an umbrella defense against the Rams, similar to the one the Giants had used effectively against the Browns. His plan was to show Los Angeles the umbrella formation at first but switch back to the team's usual formation soon after. He abandoned the umbrella defense after the Rams scored a touchdown on their first play.
The championship game took place on Christmas Eve in Cleveland a week after the conference playoffs. On the Rams' first play after the opening kickoff, Waterfield passed to Glenn Davis for an 82-yard touchdown, giving Los Angeles an early 7–0 lead. Martin was covering Davis, but slipped on the slick turf, leaving the receiver open. Graham and the Browns' offense responded with a drive later in the first quarter that evened the score, but the Rams went ahead again by a touchdown on a three-yard Hoerner rush. Cleveland scored a second touchdown in the second quarter, this time a 37-yard pass from Graham to Lavelli. Groza's extra point attempt failed, however, because of a high snap, putting the Browns behind by one point. Waterfield missed a 15-yard field goal attempt at the end of the first half, leaving the score at 14–13 at halftime.
Cleveland took the lead again in the third quarter on a 39-yard touchdown pass to Lavelli, his second of the day. The Rams responded with a touchdown run by Hoerner and another touchdown quickly thereafter when Motley fumbled and Los Angeles's Larry Brink took it into the end zone. Down 28–20 as the fourth quarter began, Cleveland was helped by interceptions by Thompson and Lahr that put its offense in good field position. On a drive with 10 minutes left to play, Cleveland went for it on fourth down three times and made the necessary yards each time, advancing to the Los Angeles 14-yard line. From there, Graham threw a touchdown pass to Bumgardner, who dove to catch it in the corner of the end zone. After several more defensive stands, the Browns had the ball back and drove toward the Rams' end zone as the game drew to a close. Graham fumbled, however, and the Rams recovered with three minutes left. Cleveland's defense held, and Los Angeles punted, giving the Browns the ball back at their own 31-yard line with 1:49 left in the game. Graham scrambled up the middle for 16 yards on the first play, and then turned to his receivers. A pass to Bumgardner and two to Jones on the sidelines, followed by another to Bumgardner, put the ball at the Los Angeles 11-yard line. Graham ran a quarterback sneak on the next play to place the ball at the middle of the field in preparation for a field goal. After a time out, Groza came in and kicked the field goal with 0:28 left on the clock to put Cleveland ahead 30–28. The Rams fumbled the ensuing kickoff and the Browns recovered, appearing to seal the victory. The officials ruled that Groza had kicked prematurely, however, and Los Angeles returned his rekick to their 46-yard line. An interception by Lahr on a sideline pass stopped the drive and gave Cleveland the win.
After the game, Bert Bell called the Browns "the greatest team ever to play football." Brown later remembered it as the best game he ever saw, pointing to the success both teams had passing the ball at a time when the emphasis was shifting across the league from running to passing. Cleveland and Los Angeles played again in the 1951 championship, which the Rams won, 24–17. The Browns went on to appear in each championship game between 1952 and 1955, including a win over the Rams in 1955.
Lavelli caught 11 passes, which set a NFL championship record that stood for eight years. He had 128 yards and two touchdowns. The Rams' Fears also had a strong game, with nine receptions for 136 yards. While Waterfield threw four interceptions, he otherwise performed well, completing 18 passes for 312 yards and a touchdown. His touchdown pass on the first play of the game to Davis was the longest score ever in a championship at the time. Graham, meanwhile, had 22 completions for 298 yards and four touchdowns.
Despite a high score, both defenses played well. Los Angeles was able to hold Motley, Cleveland's most dangerous rusher, completely in check. The Browns had five interceptions, including two by Lahr, and managed to stop the Rams from building a large lead in the fourth quarter, thanks in part to Len Ford's disruptive play at defensive end.
1 – From 1966 to 1969, the first four Super Bowls were "World Championship" games played between two independent professional football leagues, AFL and NFL, and when the league merged in 1970 the Super Bowl became the NFL Championship Game.
2 – Dates in the list denote the season, not the calendar year in which the championship game was played. For instance, Super Bowl XLI was played in 2007, but was the championship for the 2006 season.