The battle for Hot 100 supremacy this week was extra fierce, as the chart's top five titles are separated by the tightest point margin in more than six years. Miley Cyrus' "Party in the U.S.A." pushes 3-2, while also reaching the top 10 on Radio Songs/Hot 100 Airplay (12-9). Jay-Z rebounds 4-3, with help from Rihanna and Kanye West, on "Run This Town," while Jason DeRulo ascends 5-4 with his debut effort, "Whatcha Say."