Germany’s Olympic champion Alexander Zverev will face American Frances Tiafoe for a fifth title of the season on Sunday in the final of the ATP indoor tournament in Vienna. Zverev needed only 1 hour 9 minutes to dispose of Spain’s Carlos Alcaraz 6-3, 6-3 in Saturday’s semi-final while Tiafoe came from behind to shock Italian seventh seed Jannick Sinner 3-6, 7-5, 6-2. After victories in Acapulco, Madrid, the Tokyo Games and Cincinnati, Zverev is continuing his excellent form for the season said his clinical display in the last four was “the best match I have played this week. “I haven’t played …