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Ivanisevic, who claimed the singles title at Wimbledon in 2001 after finishing runner-up in 1992, 1994 and 1998, joined Djokovic's team in 2019 and helped the 36-year-old win nine Grand Slam titles.
The world No. 1 is seeking an unprecedented sixth title at the Masters 1000 event that begins next week and is regarded as the biggest tennis tournament outside of the four Grand Slams.
It marked the 38th time Djokovic has won a five-setter and kept alive the 36-year-old's quest for a fourth US Open crown that would pull him level with Margaret Court's record haul of 24 Grand Slams.
The shooting comes less than 48 hours after a 13-year old boy shot dead nine and injured seven at a school in Belgrade before turning himself in.
Using two handguns that belonged to his father, the boy fired first at the guard and three girls in a hallway and then shot his teacher and classmates in a history lesson, police said.
Serbian films are best known for their portrayal of mundaneness in life
The result left both sides on one point and needing to win their final Group G game to stand a chance of going through to the knockout stages.
The image of the flag with the message "we do not surrender" in Serbian went viral when it was shared by Kosovo minister Hajrulla Ceku.
After a goalless first half, Richarlison struck in the 62nd and 73rd minutes to help Brazil pocket three points and go top of Group G.
With this win, Brazil are well on its quest for a record-extending sixth World Cup trophy.