MARKING HIS LATEST HIGH-PROFILE HIT TEAM-UP, Zedd’s “I Want You to Know,” featuring rumored girlfriend Selena Gomez, soars onto the Billboard Hot 100 at No. 17. Following its first week of availability, the dance-pop track, co-written with Ryan Tedder and Kevin Drew, launches with nearly two-thirds of its activity from sales, entering Digital Songs at No. 7 with 100,000 downloads sold, according to Nielsen Music. The track, off Zedd’s upcoming sophomore LP, also debuts at No. 1 on Billboard + Twitter Top Twitter Tracks and blasts 9-1 on Hot Dance/Electronic Songs. “Know” is the Russian-German DJ’s fourth top 20 Hot 100 hit in as many tries: The 25-year-old, born Anton Zaslavski, reached No. 8 with “Clarity” (featuring Foxes) in 2013. In 2014, “Stay the Night” (with Hayley Williams) rose to…