Hagino taking aim at Phelps

Don't be fooled by Kosuke Hagino's quiet demeanor and toothy grin. Japan's swimming sensation plans to usher his boyhood hero, Michael Phelps, into retirement at the Rio Olympics.

The 21-year-old Hagino, who edged Phelps to take bronze in the 400-meter individual medley behind gold medalist Ryan Lochte in London four years ago, is targeting double gold in Brazil.

"I was lucky to (win a) medal in London," Hagino said on the weekend. "But this time there will be no luck involved."