Left out of the field for the first time since 1990, was Maryland (9-5) after the Terrapins lost on Saturday to Maryland-Baltimore County, 7-4.
The second half of UMass's season will start Saturday on the road against Maryland-Baltimore County.
For the final home game against Maryland-Baltimore County on March 5, the players wrote "Agel 17" on their sneakers in protest.
Their 10-6 victory against Maryland-Baltimore County on Sunday was their seventh in a row and it sent them to their first national semifinal.
Tied, 3-3, at halftime on Sunday, Delaware outscored Maryland-Baltimore County, 7-3, in the second half.
They were based in Catonsville, Maryland, and played their games at the University of Maryland-Baltimore County.
Maryland-Baltimore County managed to keep the game fairly close until the final minutes of the half.
The junior center injured his ankle on Monday night against Maryland-Baltimore County.
Central Connecticut defeated the University of Maryland-Baltimore County by 82-72 in the other semifinal game.
The championship game is set for Sunday afternoon, also at Maryland-Baltimore County.
