Roger Federer produced a wonderous display of power, grace and precision to sweep Novak Djokovic aside and reach the final four in London, ending the Serb's bid to end the year as the world number one.
"The pain was pretty sharp".
Berrettini made history by becoming the first Italian to win a singles match at the ATP Finals.
"I didn't know I hadn't beaten him in a few years, actually", he said. He was heavy favourite to win the tournament and it had taken a remarkable display by Dominic Thiem to beat him in the previous match.
The 38-year-old Swiss Master had not won against Djokovic in four years but he put an end to the four-match losing streak in style in London as he secured his 16th semi-final in 17 appearances at the ATP Finals. Djokovic and Federer will step on the court later on Thursday to determine who makes it out of the group. "I played incredibly and I knew I had to because that's what Novak does".
"There was a lot riding on the match, and I came out and I think I served great, I had great anticipation, a clear game plan", Federer said.
Djokovic wished to seize the title to dethrone Nadal in the closing week of the ATP season and Federer worn the further tension on his opponent's shoulders to his relieve, and continuously reminded himself to remain under less tension than Djokovic used to be inevitably feeling. "Looking at his career and what he still is doing, it just inspires you". Federer broke him at love following a volley error from Djokovic, celebrating an impressive victory and advancing into the semi-final where he could face Rafael Nadal.
He broke Djokovic once more within the fifth sport to take an iron grip on the match and repeated the trick to take the second set 6-Three.
"But, yeah, out in the wild where I'm not as confident and comfortable than in here, it was definitely more hard than tonight". I had a great run on the serve, as well, throughout I think that first set.
"Playing against the very best and representing your country sets the tone, sets the sport". You've got to accept that you have these kind of days and move on. Actually, it's good for me to play him again, and maybe that all helps to get a chance to get him back or whatever it is.
He said, regarding his elbow: "I hope it's nothing that will really unable me to play Madrid (sic). It was probably just an awkward, quick movement that I did, it did not pose any form of issues later on".