Djokovic and Musetti went toe to toe for almost three hours on Saturday—two hours and 59 minutes, to be exact—and it looked like Musetti might be on his way to his first ATP title in three years, as he broke in the third game of the match and held from there until he had the first set in his pocket.
After seven more holds to start the second set, Djokovic finally got his first break of the match for 5-3 and served it out to send the match to a third, where time and time again he inched ahead only for Musetti to catch back up—he led 3-1, then it was 3-all, then he led 5-3, then it was 5-all.
Serving in that 5-all game, Musetti had a point to hold for 6-5, but Djokovic not only won it, he actually ended up winning seven points in a row, breaking for 6-5 and then holding at love to finally seal the victory.
"Three hours of just a grueling match, physically super demanding," Djokovic said afterwards. "Lorenzo played really well. It could've been anybody's game, anybody's match. Congrats to him for an amazing performance and I'm just really proud of myself to get through this one."
Djokovic's victory over Musetti also means that Felix Auger-Aliassime becomes the eighth and final qualifier for the ATP Finals this year. Musetti needed to win Athens to clinch the eighth spot over the Canadian.
Both Djokovic and Musetti are now scheduled to head to Turin—Djokovic was the third player to qualify for the elite eight-man event and begins on Monday, while Musetti will be the first alternate there now.