"I started (making videos) last year, inspired by some other people. When I'm desperate, when I feel down, I do these videos, I actually feel better," Tsitsipas, who stunned holder Roger Federer in the fourth round, said.
"It makes me realize that tennis is not the most important thing in life, that we all have some other talents that we don't know about. It kind of makes me more relaxed."
Tsitsipas' relaxed outlook to life belies the determination that has helped the 20-year-old go from a bright prospect to a genuine contender for a maiden Grand Slam title at Melbourne.
It is one of the reasons Nadal will not take Tsitsipas lightly despite beating him in straight sets in their two previous meetings last year.
"When you face these young players, they are in permanent improvement. He's with confidence. He won a lot of good matches. (It) Will be a tough one," Nadal, who beat another young contender in Frances Tiafoe in the last round, said of Tsitsipas.
"For me it's always the same: you're in the semi-finals of a Slam, you can't expect an easy opponent. Stefanos is one of the best players of the world. To have the chance to be in that final, I need to play my best."
In the women's draw, twice Wimbledon champion Petra Kvitova meets American Danielle Collins for a place in the final, less than two years after bravely returning to the tour following a traumatic attack by a knife-wielding home intruder.
Former world number one Karolina Pliskova continues her quest for a maiden Grand Slam title against U.S. Open champion Naomi Osaka.
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Christian Radnedge)
