John Isner – Je älter, umso smarter

Die US-amerikanische Nummer eins erklärt Veränderungen in seiner Trainingsarbeit.

von tennisnet.com
zuletzt bearbeitet: 09.04.2016, 08:15 Uhr

KEY BISCAYNE, FL - MARCH 22: John Isner talks to members of the media during Day 2 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 22, 2016 in Key Biscayne, Florida. (Photo by Mike Ehrmann/Getty Images)