“American Idol” moves on to Las Vegas, where not everyone will hit the jackpot. Tonight, 10 singers from the Top 40 contestants perform, and five of them will get the ax. 7 p.m., Fox.

The anxiety never ends on “The Middle.” Poor Frankie (Patricia Heaton) wants to throw all her energy into preparations for watching the Oscars, but she’s worried that Brick (Atticus Shaffer) will get lost during his school trip. 7  p.m., ABC.