They used support both football and baseball. Oakland has the last multi-purpose stadium for MLB and NFL: https://en.wikipedia.org/wiki/O.co_Coliseum https://e

They used support both football and baseball. Oakland has the last multi-purpose stadium for MLB and NFL: https://en.wikipedia.org/wiki/O.co_Coliseum https://en.wikipedia.org/wiki/O.co_Coliseum Baseball needs a large oval and foot ball needs a rectangle. The compromise to support both baseball and football leads to a suboptimal solution for both.