Groggy Rublev wakes up from pre-match nap in time to beat Tsitsipas

Andrey Rublev began his ATP Finals campaign with a victory over Greek Stefanos Tsitsipas but three hours before the match, the Russian had no idea what day it was after waking up dazed and confused following a pre-match nap.

Rublev beat world number four and 2019 champion Tsitsipas 6-4 6-4 on Monday on the back of some fine serving, but the 24-year-old Russian was clearly not used to playing late after his group match was scheduled for 9 p.m. local time in Turin.

"During the day, I had a lot of time and I decided to sleep. Normally I don't sleep during the day - even if I try, I never fall asleep - and today I fell asleep for more than an hour," Rublev told reporters.

"I set the alarm for 6:00 p.m. and when I woke up, it was so dark. I felt completely broken, like if someone wakes you up at 7:00 a.m.

"I was thinking, 'No, I'm not going to wake up now. I'm going to sleep for another half hour', because normally in the morning I set many alarms. Like this, I can sleep longer. At least mentally I think like this.

"Then I look at the time and it was 6:00 p.m... I start to realise, 'Oh, I fell asleep during the day. I have a match in a couple of hours. I need to wake up'."

Rublev, second in the Green Group, next plays world number one Novak Djokovic, who beat Norway's Casper Ruud 7-6(4) 6-2.

"He's one of the greatest players in history, so I don't know what to say," Rublev said of Djokovic. "I hope I'm going to win a couple of games, but the reality is the only thing I can do is to do my best and believe in myself."