This Instagram video posted by Cowboys receiver Cole Beasley is spectacular on two levels.

First, Beasley is listed at 5-8, and he gets up high enough to throw down a reverse, two-handed jam. Sick.

Then he tags Odell Beckham Jr., in the video caption, and ends it with the hashtag #cowboysgiantsrivalry. Classic.

@OBJ_3 had his so it's only right to put one of mine up. #cowboysgiantsrivalry

A video posted by Cole Beasley (@bease11) on

According to the Dallas Morning News, Beasley has been able to dunk since he was a high school freshman. He signed with the Cowboys in 2012 after being undrafted coming out of SMU. He had 37 receptions and four touchdowns last season.

For reference, here was Beckham's dunk from a few months ago:

@kingjames im takin notes #toBored

A video posted by Odell Beckham Jr (@iam_objxiii) on

No response yet from Beckham regarding Beasley's post. But based on Beckham's account, he is gearing up for the NFL season:

And they wonder why I want it so bad, my brother gone eat up so I gotta do the same #RoyalSide @v.royalty.s

A video posted by Odell Beckham Jr (@iam_objxiii) on

The Giants and Cowboys meet in Dallas on the opening weekend of the NFL season as the NBC Sunday Night game. The Cowboys visit the Meadowlands on Oct. 25.

Check out more great dunks on ThePostGame.