Written and first recorded by John Hiatt (1974).
Hit version by Three Dog Night (US #16/CAN #18 1974).
From the wiki: “John Hiatt was working as a songwriter for Tree International, a record label in Nashville, when his song ‘Sure As I’m Sittin’ Here’ was covered in 1974 by Three Dog Night. The song became a Top 40 hit, earning Hiatt a recording contract with Epic Records. Since then Hiatt has released twenty-one studio albums, two compilation albums and one live album, and his songs have been covered by a variety of artists in multiple genres, including Joe Cocker (‘Have a Little Faith in Me‘), Bonnie Raitt (‘Thing Called Love’), The Jeff Healy Band (‘Angel Eyes’), Bob Dylan, The Searchers, Willy DeVille, Ry Cooder, Linda Ronstadt, Eric Clapton, B.B. King, Joe Bonamassa, Willie Nelson, Buddy Guy, Jimmy Buffett, Nick Lowe, Chaka Khan, and many others.
“Three Dog Night released ‘Sure As I’m Sittin’ Here’ as a single in mid 1974, where it reached #16 on the Billboard Hot 100 and #18 in Canada in 1974. It would be the group’s final Top 40 hit.”
Three Dog Night, “Sure As I’m Sittin’ Here” (1974):