Klein Field at Sunken Diamond is a college baseball stadium on the campus of Stanford University in Stanford, California. It is the home field of the Stanford Cardinal of the Pac-12 Conference. The stadium was built 86 years ago in 1931 and has a seating capacity of 4,000. When the adjacent football stadium was originally built in 1921, dirt was excavated from the site of the future baseball stadium, which created a "sunken" field a decade later.