Novak Djokovic acknowledged he was at the peak of his powers as he thrashed Kei Nishikori in the opening match of the ATP World Tour Finals in London.
World number one Djokovic extended his winning streak to 23 matches on Sunday, a masterful display securing a 6-1 6-1 triumph that typified his recent dominance of the men's singles game.
The Serbian has won the last three editions of the World Tour Finals and will surely take some stopping this year given his outstanding form.
"I think I was at my best," said Djokovic. "Undoubtedly it's been an incredible performance that I was hoping I can have coming into the match, coming into this tournament where I've had a great record in last couple of years.
"Reflecting back on those memories of course gives me more confidence, more comfort coming into every single match.
"I had for an opponent, one of the quickest tennis players, somebody that possesses a lot of talent and loves to play aggressively. But I didn't allow him to dictate the play. I mixed up the pace. I was feeling very comfortable on the court, feeling like I could get most of the balls back.
"I served efficiently. I mixed up the second serves as well, didn't give him really the same look twice. I always tried to change. The tactics worked very well."
Asked to reflect on his astonishing run of 14 straight finals prior to this event, Djokovic responded: "I have to disappoint you. I don't have one word or secret that describes the success that I had this year or in the last couple of years.
"Many different factors have happened in order for me to be where I am at this stage. I'm 28 years old. There is a reason why I've managed to reach the peak of my physical [and] mental abilities at this stage of my life.
"I've had that great joy to win a first Grand Slam when I was 21 years old [at the 2008 Australian Open]. Ever since then to this point, it's been seven years of a long process of learning, ups and downs, doubts, self-belief, some tough moments where I even considered not playing tennis back in 2010.
"You go through these stages. Everybody does. It's just a normal, natural progress and process of development where I was fortunate to really have some great people who cared about me and who helped me to get to where I am today.
"Why I'm able to continue on and kind of maintain this consistency or this success is because I'm trying to not think too much in advance. Whatever happened in the past is behind me and whatever is in the future, I don't know what's going to happen. You can't think too much about it.
"I just try to be in the moment and have a very well-balanced private life, and it reflects in the success on the court."