<p class="title">World number one Novak Djokovic was stunned in the Shanghai Masters quarter-finals by young Greek Stefanos Tsitsipas in three sets on Friday.</p>.<p class="bodytext">He will now play another highly promising talent in his Saturday semi-final match against 23-year-old Daniil Medvedev.</p>.<p class="bodytext">The seventh-ranked Tsitsipas recovered from losing the opening three games in just seven minutes to shock the reigning champion 3-6, 7-5, 6-3.</p>.<p class="bodytext">He sealed the deal with a gleeful smash and held both arms aloft.</p>.<p class="bodytext">Tsitsipas has now defeated the top-ranked Serbian twice in their three matches -- further proof that the 21-year-old is a serious contender at the top of men's tennis.</p>.<p class="bodytext">After a dreadful start, he found his feet in the second set, winning on a tie break, then went 3-1 up in the decider when Djokovic planted his forehand wide on the third break point.</p>.<p class="bodytext">It was a double celebration for the young Greek, who has also confirmed his place in the prestigious season-ending ATP Finals.</p>.<p class="bodytext">He did so after fourth-ranked Medvedev tamed self-styled "wild horse" Fabio Fognini 6-3, 7-6 (7/4) to canter into the semi-finals. Fognini was vying for a place at the Finals.</p>.<p class="bodytext">Djokovic, 32, said that he is fully recovered from a shoulder injury.</p>.<p class="bodytext">He did not drop a set in winning the title in Tokyo and had carried that form into Shanghai -- until he came across Tsitsipas.</p>.<p class="bodytext">Medvedev -- another of the next generation -- sent down 12 aces to help see off Fognini and said: "I don't know what happened, my serve was crushing it."</p>.<p class="bodytext">The Russian has a 12-0 record in quarter-finals this year and Djokovic this week described him as "very complete" player.</p>.<p class="bodytext">Roger Federer, the 20-time Grand Slam champion, faces young German Alexander Zverev later Friday in his quarter-final.</p>.<p class="bodytext">The other match is between Austria's Dominic Thiem, who beat Tsitsipas to the China Open title on Sunday, and Italy's Matteo Berrettini.</p>.<p class="bodytext">US Open champion Rafael Nadal is not in Shanghai because of a wrist injury.</p>
<p class="title">World number one Novak Djokovic was stunned in the Shanghai Masters quarter-finals by young Greek Stefanos Tsitsipas in three sets on Friday.</p>.<p class="bodytext">He will now play another highly promising talent in his Saturday semi-final match against 23-year-old Daniil Medvedev.</p>.<p class="bodytext">The seventh-ranked Tsitsipas recovered from losing the opening three games in just seven minutes to shock the reigning champion 3-6, 7-5, 6-3.</p>.<p class="bodytext">He sealed the deal with a gleeful smash and held both arms aloft.</p>.<p class="bodytext">Tsitsipas has now defeated the top-ranked Serbian twice in their three matches -- further proof that the 21-year-old is a serious contender at the top of men's tennis.</p>.<p class="bodytext">After a dreadful start, he found his feet in the second set, winning on a tie break, then went 3-1 up in the decider when Djokovic planted his forehand wide on the third break point.</p>.<p class="bodytext">It was a double celebration for the young Greek, who has also confirmed his place in the prestigious season-ending ATP Finals.</p>.<p class="bodytext">He did so after fourth-ranked Medvedev tamed self-styled "wild horse" Fabio Fognini 6-3, 7-6 (7/4) to canter into the semi-finals. Fognini was vying for a place at the Finals.</p>.<p class="bodytext">Djokovic, 32, said that he is fully recovered from a shoulder injury.</p>.<p class="bodytext">He did not drop a set in winning the title in Tokyo and had carried that form into Shanghai -- until he came across Tsitsipas.</p>.<p class="bodytext">Medvedev -- another of the next generation -- sent down 12 aces to help see off Fognini and said: "I don't know what happened, my serve was crushing it."</p>.<p class="bodytext">The Russian has a 12-0 record in quarter-finals this year and Djokovic this week described him as "very complete" player.</p>.<p class="bodytext">Roger Federer, the 20-time Grand Slam champion, faces young German Alexander Zverev later Friday in his quarter-final.</p>.<p class="bodytext">The other match is between Austria's Dominic Thiem, who beat Tsitsipas to the China Open title on Sunday, and Italy's Matteo Berrettini.</p>.<p class="bodytext">US Open champion Rafael Nadal is not in Shanghai because of a wrist injury.</p>