rebound.Serving at 1 all in the decisive set, Tsitsipas committed four forehand errors to drop serve and trail 1-2.
Then while leading 4-2, Tiafoe struck a 83 miles per hour crosscourt forehand return winner to lead 15-0.
Tiafoe followed up more aggressive play with forceful volleys while high fiving courtside fans before breaking serve again to lead 5-2.
While serving for the match, the American serve and volleyed as he had earlier in the match to reach 15-30 after striking a crosscourt forehand volley winner.
At 30 all, Tiafoe struck a 130 miles per hour ace down the tee which he followed up with a 128 miles per hour ace out wide to end the match.
However in the final round versus Zverev, Tiafoe was unable to repeat his earlier tennis level as Zverev mixed defense with a powerful offense.
The German broke Tiafoe's serve early in both sets before winning 7-5, 6-4.