The phrase "stacked field" means a situation where there is a high level of competition or a lot of skilled individuals competing against each other. Full definition
It's like having fields - but very tiny stacked fields - at the chef's fingertips no matter the season. (innbythesea.com)
August 17 will start with American Ashton Eaton working to defend his 2012 decathlon gold medal against an always - stacked field of competitors. (sbnation.com)
Both times against stacked fields comprised with the likes of Matt Kenseth, Kyle Busch, Kevin Harvick and Joey Logano. (sbnation.com)