Carlos Alcaraz insisted his father was just "a huge fan of tennis" after he reportedly filmed Novak Djokovic in a training session at Wimbledon.
Spanish top seed Alcaraz, who beat Denmark's Holger Rune in the quarter-finals, admitted "probably it is true" when asked about the issue.
"My father is a huge fan of tennis," he said after his impressive 7-6 (7/3), 6-4, 6-4 victory on Centre Court.
"He doesn't only watch my matches. I think he gets into the club at 11am, gets out at 10pm, watching matches, watching practice," he said. "Being able to watch Djokovic in real life, yeah, probably it is true he's filmed the sessions."
US Open champion Alcaraz, who is through to his first Wimbledon semi-final, remains on track for a potential title showdown with defending champion Djokovic on Sunday. But he denied any filming would give him a competitive advantage.
"I have a lot of videos from Djokovic on every platform. I think it's not an advantage for me."
The world No 1 said he was looking forward to today's last-four clash against Russian third seed Daniil Medvedev, who ended the run of unseeded American Christopher Eubanks 6-4, 1-6, 4-6, 7-6 (7/4), 6-1. "He's playing great on grass," Alcaraz said of Medvedev. "I think I'm playing great, a lot of confidence right now. So it's going to be a really good match."
Djokovic, chasing an eighth title at the All England Club and 24th career major, faces Italian eighth seed Jannik Sinner in the other semi-final.
