Nieves Mardie Cornejo
- Bats Right, Throws Right
- Height 6' 3", Weight 200 lb.
- School Miami University, University of Tulsa
- High School Wellington (KS) High School
- Debut April 8, 1978
- Final Game September 29, 1978
- Born August 5, 1951 in Wellington, KS USA
The father of Nate Cornejo, Mardie Cornejo appeared in 25 games for the New York Mets in 1978, his lone big league season, posting an ERA of 2.45 in 36 2/3 innings with a record of 4-2 and 3 saves. A New York Times article  indicated that Mardie had one game where he gave up five runs in one inning; but for that one game, he would have had a 1.25 ERA.
Mardie was with the Tulsa Golden Hurricane in the early 1970s when it was a baseball powerhouse, after starting out at Miami of Ohio. Drafted in the 21st round in 1973, he spent most of his minor league career in the Mets organization. From 1973 to 1975, he was a starter. In 1976, when he became a reliever, his ERA dropped to 2.31 with the Jackson Mets in the Texas League. The following year, it was 2.64 as he went 11-6 with 14 saves for the AAA Tidewater Tides. He was traded in March 1979 to the Detroit Tigers and spent the season in the minors with the Evansville Triplets. He went 5-5, 5.42 in 31 games and retired.