Marshmello's "Happier" f/Bastille (Capitol/Astralwerks) will remain in the top spot for a third week, but Panic! At The Disco's "High Hopes" (Crush) looks to be the week's Greatest Gainer and is closing in fast. Ariana Grande's "Breathin" (Republic) and Halsey's "Without Me" (Capitol) both have big spin gains inside the Top 10, plus Ariana moves into the Top 15 with her other smash, "thank u, next." Looking to chart will be Lukas Graham's "Love Someone" (Warner Bros.) and also watch out for the newly-released Mark Ronson collab "Nothing Breaks Like A Heart" f/Miley Cyrus (RCA).