It's the battle rounds this evening and first up on Team Will is Kiki deVille and James Byron, who singing Because The Night.
The Black Eyed Peas star says he's after "Amazingness, vulnerability and confidence"... so, not too much then.
Fortunately for the pair both impress their mentor with a "flawless and immaculate" performance but it leaves Will finding it it nearly impossible to decide who goes through.
The rapper ends up running off set to go to the "toilet" leaving the acts, other coaches and studio audience in limbo.
Later (after returning from the loo) Will pits Iesher Haughton and Femi Santiago against one another with Stop, Look, Listen by Diana Ross & Marvin Gaye.
Will admits after the performance: "That was incredible. It's going to be hard choosing between you two. I should've never put you guys together."
Kylie Minogue adds: "That was splendid, beautiful, lovely and stylish. Beautiful harmonies, delicious.
Sir Tom says: I know Diana Ross very well but Iesher brought something Fresh which wasn't there before. Even though I know Will doesn't want to lose either one of you it made for a great duet.
Left with a "potential nun chuck up inside his cranium", Will thinks out loud: "You're damned if you do and you're damned if you don't, do I have anyone to compete with Femi... kinda, Jermain in a way, do I have anyone to compete with Iesher, no..."
See who Will picks on The Voice tonight on BBC One from 7PM!