Bruno Mars’ second single “Grenade” earns him his second solo No. 1 single on the Billboard Hot 100 singles chart. Bruno also becomes the first male solo acts since 1997 to have his first two singles got to No. 1. The last time that happened was with Puff Daddy with “No Time” and “Canât Hold Nobody Down.””Grenade” moves 2-1 after selling an astonishing 559,000 digital downloads last week, Billboard reports.This is Brunoâs third trip to the top of the chart this year. He started his No. 1 career with B.o.B as the featured artist on “Nothinâ On You,” then made his mark alone with “Just The Way You Are,” the first single from his debut album, Doo-Wops and Hooligans.