Whoa! Nathan Sykes crushed it in his second round of Pop Clash! The singer's "More Than You'll Ever Know" beat out Jason Derulo's "Want to Want Me." This week, Nathan is up against Rihanna's "Bitch Better Have My Money." Which song should win the Pop Clash?

Nathan Sykes' "More Than You'll Ever Know" is exactly the kind of song to kick off a solo career. It's fresh, fun, classic and shows off the singer's amazing vocals. It also doesn't hurt that we swoon a little when he sings, "It's a cold, cold world when I'm without you / Don't you know, know girl, I'm lucky I found you."

Rihanna, on the other hand, is full-on confidence and attitude in her new single, "Bitch Better Have My Money." It's already one of the biggest songs of 2015 — and understandably so. Despite the insane catchiness of the track, we definitely don't want to owe RiRi any cash after hearing how she calls the shots.

Which song should win the Pop Clash? You can vote for Nathan Sykes’ “More Than You’ll Ever Know” or Rihanna's "Bitch Better Have My Money" once an hour until the polls close at 3PM ET on April 13.

Watch Nathan Sykes' "More Than You'll Ever Know" Video

Listen to Rihanna's "Bitch Better Have My Money"