
Roger Federer of Switzerland defeated Alexander Zverev. Photo by Julian Finney/Getty Images
Roger Federer of Switzerland defeated Alexander Zverev. Photo by Julian Finney/Getty Images
Federer pleased to 'show that quality of mine' to beat Zverev and reach last four of ATP World Tour Finals
Swiss master wins 7-6, 5-7, 6-1 and looks like a top contender to win season-ending tournament