John Isner pays tribute to Roger Federer

John Isner acknowledged that Roger Federer was a great champion and underlined that the Swiss' impact on the game of tennis was absolutely tremendous. Federer, a 20-time Grand Slam champion, is considered as the ultimate tennis icon. Throughout his career, Federer was one of the most beloved and respected players among his colleagues and tennis fans. Federer transcended the game of tennis and will always be remembered as one of the greatest players in tennis history."Some of Fed&r