Tsitsipas is at the top of the Austrian capital. American Frances Tiafoe is waiting for the 23-year-old in the second. Tafoe won 6-4, 6-4 against Dusan Lajovic from Serbia.
The Norwegian Casper Ruud has also successfully taken the opening hurdle. The number nine in the world defeated Lloyd Harris from South Africa in two close sets 7: 5, 7: 6 (7: 2).
Félix Auger-Aliassime had no problems: The Canadian clearly defeated Ricardas Berankis from Lithuania 6: 3, 6: 2.
Olympic champion Alexander Zverev has also registered for the tournament in Vienna. The German meets Filip Krajinovic from Serbia (live scoring) in his opening match.
Victory against Duckworth: Struff reached the last 16 in Saint Petersburg
