Mike Leach understood the job in front of him exactly 20 years ago.

Bob Stoops hired Leach to revive an Oklahoma offense that dipped to historically bad numbers prior to that 1999 season.

Two decades later, Alex Grinch — who officially was named the Sooners’ next defensive coordinator on Jan. 4, 2019 — faced the same challenge.

Take a look back at his first year as OU's defensive coordinator here.