Coach Mercer began his college playing career here at North Lake College as a middle infielder. After obtaining his associate's degree and finishing his eligibility at North Lake, he earned a scholarship to continue his education and college playing career at UNC-Asheville. Upon arriving at UNC-Ashville he made the move to the outfield, where he started in more than 100 games over the next two seasons.
After completing his playing career, Corey moved back to Texas. While finishing his B.S. in Economics at UT-Arlington, Corey began his coaching career where his college playing career started, and became the assistant coach at North Lake College in the fall of 2001. In the fall of 2004, Corey was named the fourth head coach in North Lake history.
Since taking over the program, 79 blazers have continued their college playing careers at four-year institutions, with 18 of those at the NCAA D1 level. Coach Mercer has had one player taken in the MLB draft by the Boston Red Soxs, another signed as a free agent after the draft by the St. Louis Cardinals, and multiple others that have played and continue to play, in independent professional leagues across the country. In the past five seasons under the leadership of Coach Mercer, the Blazers have won a Metro Athletic Co-Conference Championship and two runner-ups. The Blazers have made the post season 12 out of the 13 season that Coach Mercer has been at the helm.
Coach Mercer and his wife Patricia live in Keller with their three children, Cooper, Caroline, and Carson. He completed his Master’s of Education in Kinesiology at Dallas Baptist University in 2017.