Another mediocre sales week, with seven of the eight holdovers from last week’s Top 10 experiencing slippage. The exception: Maroon 5’s “Sugar,” which enjoyed an 8% uptick. The biggest comer by a mile was the Zedd/Selena tandem, which gained 720% in its second week—but its first full one. Those two records give Interscope two reasons to be cheerful. The other newcomer, from Pitbull & Ne-Yo, completed its 15-week march toward the leaderboard behind a 17% jump.