There is a battle brewing for #1! ZAYN & Taylor Swift's "I Don't Wanna Live Forever" (UStudios/RCA) is getting closer to clinching the top spot, but it will be down to the wire. There's not a lot of movement in the Top 20, but Lorde is set to break inside with "Green Light" (Lava/Republic), which is once again one of the week's Greatest Gainers. Both Calvin Harris' "Slide" f/Frank Ocean and Migos (Columbia) and Martin Garrix & Dua Lipa's "Scared To Be Lonely" (RCA) join the Top 30. Charting this week will be Jason Derulo's "Swalla" f/Nicki Minaj & Ty Dolla $ign (Beluga Heights/Warner Bros.) and AJR's "Weak" (AJR Prod/RED).