RIO DE JANEIRO, BRAZIL - AUGUST 20:  Matthew Centrowitz of the United States reacts after winning gold in front of Taoufik Makhloufi of Algeria and Nicholas Willis of New Zealand in the Men's 1500 meter Final on Day 15 of the Rio 2016 Olympic Games at the Olympic Stadium on August 20, 2016 in Rio de Janeiro, Brazil.  (Photo by Cameron Spencer/Getty Images)