Queen's: Tsitsipas says win over Edmund was 'nerve-wracking'
Tsitsipas was supposed to take on British No 1 Kyle Edmund on Tuesday afternoon.
However, rain caused havoc in west London and the pair did not get their first-round tie underway until last night.
Tsitsipas was cruising to victory at 6-4, 3-3 (30-30) when rain fell and they were made to continue their match this afternoon.
The young Greek held serve and broke in the 12th game to seal second final set 7-5.
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And he claims the nerves got the better of him throughout the duration of the tie.
"It was kind of nerve-wracking to kind of say," Tsitsipas said.
"This match lasted two days so I had to come back today from three-all in the second set.
"The nerves were tough to deal with.
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"I somehow managed to keep my serves and my momentum going and didn't disrupt my tempo.
Tsitsipas will take on Jeremy Chardy in the second round this afternoon.
But he did not know the Frenchman had beaten Mikhail Kukushkin yesterday.
"Oh is that who I am playing," he said.
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"He has an aggressive game, big forehand and big serve. I am going to have to deal with it and find ways of getting out of there."
There are fears Tsitsipas may struggle with the turnaround of two matches in quick succession.
But Amazon tennis pundit Greg Rusedski does not reckon it will be a problem for the top seed.
"It is difficult for anybody to be honest because you get the adrenaline," he said.
"Seven match points to win that match so you have got to cool down, make sure you get your stretching and some food inside of you. He'll be fine towards that. But when I look at it he was not full of confidence on this surface so far."