Karen Khachanov, ranked 13 in the world, lost to Talon Grikspoor from the Netherlands in the first round of the ATP 500 tournament, which started in Vienna, the capital of Austria.
The world number 28 defeated the Armenian tennis player representing Russia with a score of 6-3, 5-7, 6-4.
The next competitor of Greekspur will be Brandon Nakashima of USA, who defeated Italian Luciano Darderi (6-2, 7-5).