Alex and Sierra

This round, Alex & Sierra are facing off against three times the starpower. That's right: Jessie J's 'Bang Bang' featuring Nicki Minaj and Ariana Grande.

This week, Alex & Sierra's 'Scarecrow' faces off against Jacob Latimore's 'Heartbreak Heard Around the World.'

X Factor Winners Debut Single

5 Seconds of Summer's 'Amnesia' is up against 'The X Factor' stars Alex & Sierra's 'Scarecrow.' Who do you think should win Pop Clash?

When Alex and Sierra were shown in the holding room I thought they were annoying.  I was wrong.  Once they got onstage they were awesome.  Their cheesy love was actually really cute onstage.  You could see how nervous they were and their version of 'Toxic' was cool and sexy...