This year's Bank of America Shamrock Shuffle 8K has no shortage of elite runners, and some of them are sharing their excitement on social media in advance of the race's Sunday kickoff.

Reigning champ Stephen Sambu, who has taken first place in the past three Shuffles, posted a picture of his race bib on Twitter with nothing but the statement: "I'm returning to @ChiShuffle #ShamrockShuffle."

Sambu is hoping for an unprecedented fourth consecutive victory. 

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Laura Thweatt has been prepping for the Shamrock Shuffle, her first race in 11 months following an injury. She said she can't wait to get back to running.

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Wheelchair racer Amanda McGrory of Aurora is back and hopes to take home first place in the wheelchair race for the second year in a row.

"We’re just over a week away from one of my favorite non-marathons of the season, and this time I’m bringing a friend," McGrory wrote in an Instagram post.

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Olympian Carrie Tollefson, who ran in the 2004 Summer Games, posted a picture decked out in her Shamrock Shuffle hat. 

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And the official Bank of America Shamrock Shuffle social media accounts are especially excited. They are calling on everyone to help "shamROCK" the town.

Registration for this year's Shamrock Shuffle is now closed, but you can livestream the event on the NBC Chicago app or right here on the NBC Chicago website.

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