By Kevin Fishbain and Eli Kaberon

Andrew Luck and Robert Griffin III have never taken snaps in an NFL game, yet they already have developed a rivalry. Because they were the first and second picks in the 2012 draft, the two quarterbacks will go through their careers constantly being compared to one another. Luck will always be the measuring stick for RG3, and vice versa, until their careers end.

That’s the bond that comes with the top two draft picks both playing the most important position in the sport. Luck and Griffin are the fifth QB duo since the NFL merger in 1970 to go first and second overall. Only time will tell how their rookie seasons and careers will unfold, but based on recent history, one could be destined for great success and the other headed for disappointment.

Here are the four other QB pairs that have gone No. 1 and No. 2 in the draft since 1970, with a close look at how they played during their rookie seasons.

No. 1 Jim Plunkett and No. 2 Archie Manning / 1971 — Both players saw plenty of playing time during their rookie campaigns. Plunkett, who was taken by the Patriots, started all 14 games for the team, throwing 19 touchdowns and 16 interceptions en route to a 6-8 season. He wound up playing five years in New England before finding greater success with the Raiders, whom he led to victories in Super Bowl XV and Super Bowl XVIII. Manning played in 12 games for the Saints in ’71, but it likely felt like a lot more because of the poor offensive line in front of him. As a rookie, he was sacked 40 times, the most in the NFL that season, a reason why he threw nine interceptions and had seven fumbles. Manning being hit was a common sight during his career, as he was sacked 40 or more times in four of his 11 years in New Orleans. The two-time Pro Bowler never produced a winning record as a starter.