Kyrgios celebrates his victory over Federer at the Madrid Open. Credit:Reuters "I know he's the greatest but I wasn't intimidated at all. I have a lot of respect for him, I think this is my greatest win so far," Kyrgios said. "Before the match I didn't feel nervous or anything like that. I was just excited to get out to the court. "I've been playing well recently on the clay, so I knew I had a good chance to go out there and do well. I stuck to my game and served well and I got the win." Kyrgios is just the fifth player aged 20 or under to beat Nadal and Federer, joining Novak Djokovic, Mario Ancic, Tomas Berdych and Juan Martin del Potro.

Roger Federer reacts during his match against Nick Kyrgios. Credit:Reuters "I was definitely thinking about the finish line, which is probably not the greatest thing, especially against Federer," Kyrgios said. "He's going to take advantage of that. Kyrgios saved three match points to set up a showdown with John Isner in the next round. Credit:Getty Images "But I thought as I was saving match points and he was saving match points, just have to go through your routine and pick a spot on your return, and try and do whatever you can.

Federer and Nadal are two of the greatest players of the modern generation. Federer is the current world No. 2 and was the No. 1 seed for the tournament in Madrid. Kyrgios and Federer shake hands after the Canberran's three set victory. Credit:Getty Images "I couldn't return his first serve, I had a horrible performance on return of serve," Federer said. "That made life difficult for me. I'm disappointed with how I played on return and that cost me the match." Nick Kyrgios celebrates defeating Roger Federer during day five of the Mutua Madrid Open. Credit:Getty Images

There's a massive contrast in statistics between Federer and Kyrgios. Federer has claimed 85 career titles, has been on the professional circuit for 17 years and has almost $90 million in career prizemoney. Kyrgios started his professional career in 2013, is still searching for his first title and has made $1.13 million so far. But if indications are anything to go by, Kyrgios is laying the foundation for a huge future and a long career near the top of the world rankings. Kyrgios, the youngest player in the world's top 50, showed some of his trademark fire in beating Federer, saving three match points of his own to set up a showdown with John Isner for a place in the quarter-finals.

Toppling Federer is a huge boost ahead of the French Open later this month and Kyrgios continues to match the world's best players. With fellow Australian junior Thanasi Kokkinakis, brother Christos and coach Todd Larkham watching from the stands, Kyrgios showed a massive amount of grit in the last set to overcome Federer. He mixed his superb power with brilliant touch on the clay courts and had to keep his composure as Federer refused to give in during the last-set tie break. Kyrgios blasted 21 aces compared to Federer's 17, and somehow found a way to win despite being behind in almost every statistic category - including double faults, winners and unforced errors. Kyrgios' world No. 35 ranking is also set for a big boost and he has proven he has overcome his early-year injury woes to be back to his best.

The former Daramalan College graduate made two grand slam quarter-finals as a 19-year-old, becoming the first teenager to achieve the feat since Federer. Kyrgios made the Australian Open quarter-finals despite having played just four matches in four months and powering through the pain of a bone-stress injury in his back. His win against Federer follows his runner-up effort at Richard Gasquet in Estoril last week. "I like the big tournaments," Kyrgios told ATPWorldTour.com before playing Federer. "Obviously I didn't play the Australian Open at 100 per cent and I had such a great opportunity to do well there. I just had to go back home and get healthy.