“The Sing-Off” (8 p.m., NBC): “The Sing-Off,” with its enthusiastic a

“The Sing-Off” (8 p.m., NBC): “The Sing-Off,” with its enthusiastic a cappella crooners, has been a fun diversion. Tonight, the final three groups find out who claims the $100,000 grand prize and recording contract.

“The Closer” (9 p.m., TNT): Season 5 of “The Closer” winds up with Brenda looking into a case that is tied to a female police officer who might be a victim of spousal abuse. Mary McDonnell guest stars.

“Make My Day” (10 p.m., TV Land): “Make My Day” is a hidden-camera series that doesn’t make jokes of its subjects. Instead, it fulfills their wishes by setting up lucky coincidences and even chance meetings with their favorite celebrities.