World No. 1 Novak Djokovic had to leave the 2020 US Open early because of an unfortunate incident involving him and a lineswoman. Playing against Pablo Carreno Busta in the pre-quarterfinals at Flushing Meadows, Djokovic angrily hit a ball towards the wall after losing a point. But the ball accidentally ended up hitting a lineswoman and injuring her, so the match referee disqualified the Serb from the match.The incident has elicited mixed views from experts as well as fans. Some are defending Novak Djokovic, while others are convinced that the decision was right. Most disturbingly, however, there are some who are attacking the unfortunate lineswoman, for supposedly making a big deal out of nothing.Former World No. 1 doubles player Rennae Stubbs has now come out in support of the lineswoman. The Aussie believes the lady was totally innocent in the matter, and that she should be left alone.Stubbs posted the following message on her Twitter handle earlier today:"LET ME SAY THIS LOUDLY! Anyone who blames the lines lady for the default of Novak..... STOP! The lady had NOTHING to do with the default! Repeat! Nothing!!! Ok!!!! ITS A RULE! There was NOOOOO WIGGLE ROOM ON THIS! NONE!!"LET ME SAY THIS LOUDLY! Anyone who blames the lines lady for the default of Novak..... STOP! The lady had NOTHING to do with the default! Repeat! Nothing!!! Ok!!!! ITS A RULE! There was NOOOOO WIGGLE ROOM ON THIS! NONE!!— Rennae Stubbs (@rennaestubbs) September 7, 2020Stubbs also went on to question those who were arguing that Novak Djokovic should have been given some leeway since he never intended to hurt the lineswoman. According to the Aussie, the rule is very clear on the matter and there are no 'ifs ands or buts' about the Serb's penalty.No no no....tell me you didn’t just say he shouldn’t have been DQd??? Seriously! I now he’s your guy but no, just no. There is NO IF ANDS OR BUTS about this! This is a clear ball abuse dangerous play and there is NO WAY AROUND IT. Just ask Tim Henman.— Rennae Stubbs (@rennaestubbs) September 7, 2020Later, Stubbs turned her attention to a troll who was claiming that the lineswoman was standing out of position and so deserves some part of the blame. She questioned the tennis knowledge of the person making that claim, and even called him a 'dingdong'.U don’t watch much tennis do you! She’s in her position u dingdong! She’s standing right on the singles line!!! 🙄🙄🙄🙄 go back to sleep— Rennae Stubbs (@rennaestubbs) September 7, 2020How the world reacted to Novak Djokovic's US Open defaultWhile the Grand Slam rule-book suggests that the officials made the right call to default Novak Djokovic, their decision has sparked a massive debate on social media platforms. The lineswoman in particular has come under the scanner for no fault of her own, with assumptions about her role and behavior flying thick and fast.Professional athlete Brandon Paul claimed that line judges have the training to dodge even 100+ mph shots. Sharing the video of the incident, he wrote on Twitter that the lady deserved an Oscar for her performance. Djokovic did NOT mean to hit the lady obviously ...also they’re trained to dodge 100+ mph serves & what not - I hope she’s fine but also...she deserves an Oscar 😩 this is RIDICULOUSNESS #USOpen pic.twitter.com/CYjwW9mS6S— Brandon Paul (@BP3) September 6, 2020Some Twitter users even compared the lady with Brazilian footballer Neymar Jr, who is notorious for his play-acting on the field.Lady Neymar🙈 #Djokovic pic.twitter.com/4NW6DMiFXo— Leonardo DiTintin (@iamtintin__) September 6, 2020Since Novak Djokovic didn't seem to have hit the ball too hard, there have also been opinions saying that a younger person should have been on the court, working as the line official instead of the lady.He didn’t hit it dangerously or recklessly he tapped it. Lol what an awful decision. @usopen . Lady shouldn’t have been on the court any young athlete would have caught the ball. Just no business black balling Djokovic for his 18th GS. Terrible. Never watching again. https://t.co/ojEYPMKeiP— Corey Howard (@CoHo3nd20) September 6, 2020On the other side, the likes of Rennae Stubbs and Billie Jean King have vociferously defended the lady and expressed grief over her injury, besides backing the officials' call to default Djokovic.Here are my thoughts on the Novak Djokovic default.First I hope the line judge is okay.The rule is the rule. It is unfortunate for everyone involved, but in this specific situation the default was the right call. #USOpen— Billie Jean King (@BillieJeanKing) September 6, 2020What's next for Novak Djokovic after his US Open default?Novak Djokovic was the overwhelming favorite to win the US Open 2020. But now he will return to Europe with the rest of his team, looking ahead to the clay-court season.The Internazionali BNL d'Italia 2018 - Day FiveThe clay swing of the ATP tour kicks off tomorrow with the Generali Open in Austria. While Djokovic will not participate in that ATP 250 event, he is expected to participate in the Rome Masters next week.