Keegan Murray calls for the ball. A sweat stain lines the back of his gray shirt. He’s been shooting jumper after jumper in a gym about 10 minutes away from downtown Chicago. Midrange off the dribble. Five spots of 3s. Jab left and pull up. He often won’t move to the next spot until he executes each drill perfectly. Until each release feels just right. It’s drizzling outside on this late-April morning. The sky is a deep gray-blue. A park sits across the street. This unassuming gym, which has a sign near its entrance that reads “To whom much is given, much will be required,” is where he’s been training for this week’s NBA combine in Chicago. Murray is one of the most intriguing participants in attendance. He leapfrogged from a barely recruited prep to a superstar sophomore at Iowa, to a projected lottery NBA pick in next month’s draft. Some mock drafts even have him projected to be a top-five pick.