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INDIAN WELLS, CA - MARCH 18: Roger Federer of Switzerland hits forehand volley against Jack Sock of the United States in their semi final match during day thirteen of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2017 in Indian Wells, California. (Photo by Kevork Djansezian/Getty Images)

INDIAN WELLS, CA - MARCH 18:  Roger Federer of Switzerland hits forehand volley against Jack Sock of the United States in their semi final match during day thirteen of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2017 in Indian Wells, California. (Photo by Kevork Djansezian/Getty Images)