LOUDON, NH - JULY 16: Denny Hamlin, driver of the #11 FedEx Office Toyota, celebrates after winning the Monster Energy NASCAR Cup Series Overton's 301 at New Hampshire Motor Speedway on July 16, 2017 in Loudon, New Hampshire. (Photo by Sean Gardner/Getty Images)

Denny Hamlin jumps into Twitter fray and slams a rival driver

The war of words on Twitter between NASCAR drivers Brad Keselowski and Kyle Busch Friday during practice runs in Chicago grew when Busch's Toyota teammate Denny Hamlin jumped into the fray.

Hamlin was responding to an earlier tweet by Keselowski, who races for Ford, suggesting that Toyota Racing's success was more to do with favoritism from NASCAR than the work of the team. Toyota Racing took the top 4 spots on Friday.

That led to this profane response from Busch.

Busch and Keselowski are longtime rivals known to have an icy relationship, but things certainly heated up between the two on social media. Busch later explained to NBC Sports that he felt Keselowski's tweets were out of line and discounting all the hard work his team has put in.

"I've just got to say of how proud I am of all our Toyota, TRD teammates and guys and teams, Furniture Row, Joe Gibbs Racing, TRD ... the whole package is there. It takes a lot of hard work and dedication from a lot of great people, and I feel like right now all he's doing is slapping these people across the face."

Keselowski wanted to get in another word via Twitter.

The flag drops at 3 P.M. Eastern Sunday. We'll see then how well these tweets turn into action on the track.