"Good for You" by Interscope's Selena Gomez f/A$AP Rocky had the biggest debut week of any digital single this year, moving 179k tracks. That brisk beginning saw the Pop siren's smoky new jam outselling two of the toughest competitors on the field right now, the mighty Taylor Swift's "Bad Blood" and breakout monster "Cheerleader" by OMI. It also surpassed Gomez's prior career best sales week (for "Come and Get It"). As we note in today's Top 10 Tracks, the test of its longevity comes now; "Good for You" is currently #7 on the iTunes singles rundown.