My predictions about winner of 'Best Pop Solo Performance'.
Katy Perry - Roar (around 25%).
Sara Bareillis - Brave (around 5%).
Justin Timberlake - Mirrors (around 20%)
Bruno Mars - When I Was Your Man (around 30%).
Lorde - Royals (around 20%).
So, JT will not attend at Grammy (Idk, but some sources said this), main battle will be betweet Katy and Bruno.