Floyd Mayweather, Jr.
In May 2015, Kellerman covered the Floyd Mayweather, Jr. vs. Manny Pacquiao boxing match for HBO. He received criticism online for his post-match interview with Manny Pacquiao. "The Guardian" stated that his line of questioning was, "interpreted as patronizing" as his wording to Pacquiao was "You thought you won today, Why?" However, Kellerman retorted that he "had to ask him" about his disagreement with the judges' adjudication.