Novak Djokovic's US Open participation is looking more doubtful with each passing day. Current regulations in the United States state that he would be denied entry into the country as an unvaccinated person, and several tennis fans are unhappy about that.The situation looks particularly incongruous given the recent visuals of a large group of immigrants entering the country through the southern border without any vaccine requirements.American activist Tom Fitton has reacted to the situation on social media, expressing the belief that there is an inconsistency in adherence to regulations. Fitton has criticized the government for that and sympathized with Djokovic."So Novak Djokovic won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?" Fitton wrote on Twitter.Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?66742443So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?His tweet drew varied reactions from fans, who are miffed that the Serbian tennis great will likely miss out on playing the final Grand Slam of the year."So they believe in my body, my choice unless you are the greatest male tennis player of all time?" a fan tweeted.Double Eagle@Doubleeagle25@TomFitton @shawnte40 @DjokerNole So they believe in my body, my choice unless you are the greatest male tennis player of all time?111@TomFitton @shawnte40 @DjokerNole So they believe in my body, my choice unless you are the greatest male tennis player of all time?maga taco gal 🌮 ❤️@ValDawnDallasThis is insane and there is absolutely no way to defend such stupidly!!! twitter.com/tomfitton/stat…Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?41So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?This is insane and there is absolutely no way to defend such stupidly!!! twitter.com/tomfitton/stat…Ted J@TedJoisThis is so true and bugs the heck out of me. twitter.com/TomFitton/stat…Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?66742443So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?This is so true and bugs the heck out of me. twitter.com/TomFitton/stat…Novak Djokovic has time and again expressed his unwillingness to get vaccinated. He reiterated that stance after winning the Wimbledon title last week, stating that the only way he could enter the US to play the US Open would be through a relaxation in the guidelines."Maybe @DjokerNole can come in through the river on the Southern border?" one fan sarcastically tweeted.Anna@aanaaxoMaybe @DjokerNole can come in through the river on the Southern border? twitter.com/TomFitton/stat…Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?66742443So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?Maybe @DjokerNole can come in through the river on the Southern border? twitter.com/TomFitton/stat…Ronald Edwards@MonsterResource@TomFitton @DjokerNole And it’s a solo sport that’s played outdoors..71@TomFitton @DjokerNole And it’s a solo sport that’s played outdoors..PC@PaulChr91381477@TomFitton @DjokerNole Djokovic will be here for two weeks. Southern border crossers are here for a lifetime. Follow the science!4@TomFitton @DjokerNole Djokovic will be here for two weeks. Southern border crossers are here for a lifetime. Follow the science!Some fans expressed their belief that the Serb's absence from the US Open only spells bad news for the event and leaves the New York Major poorer."Doesn’t make any sense but nothing that is happening makes sense… the US OPEN loses from this because he’s #1 tennis player and won’t be allowed to play. For a virus with 98% survival," another fan expressed.LeelaLinda@LeelaLinda10Doesn’t make any sense but nothing that is happening makes sense… the US OPEN loses from this because he’s #1 tennis player and won’t be allowed to play. For a virus with 98% survival. twitter.com/tomfitton/stat…Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?66742443So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?Doesn’t make any sense but nothing that is happening makes sense… the US OPEN loses from this because he’s #1 tennis player and won’t be allowed to play. For a virus with 98% survival. twitter.com/tomfitton/stat…LeeZ@LeeCZ73@TomFitton @DjokerNole The real loser in this situation is the US Open. Without Djokovic playing the tournament loses any real credibility. The eventual winner will have the invisible asterisk next to their name.272@TomFitton @DjokerNole The real loser in this situation is the US Open. Without Djokovic playing the tournament loses any real credibility. The eventual winner will have the invisible asterisk next to their name.P.I.G.=Par. Is. Good.@RandyKingWalkerYep. Crazy isn’t it twitter.com/tomfitton/stat…Tom Fitton@TomFittonSo Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?66742443So Novak Djokovic (@DjokerNole) won't be allowed to play in US Open because he refuses to have an irreversible medical treatment -- yet this Biden administration encourages and helps millions of illegal aliens to invade our country with no similar vaccine requirements?Yep. Crazy isn’t it twitter.com/tomfitton/stat…"Not the end of the world" - Novak Djokovic on potentially missing the US Open2021 US Open - Day 14During a recent interview, Novak Djokovic claimed that he values his stance against getting vaccinated above other things. He also stated that not getting to play in the US Open and other events with similar requirements would not be the "end of the world" for him."I have my stance, and I am proponent always for freedom to choose what is best for you. And I respect everything and everybody, and I expect at least people to respect my decision. If I have a permission, I'll be there. If I don't, I'll not be there. It's not the end of the world," said the Serb.While Djokovic stressed that he would only try to enter the US if the rules allowed him to, the 35-year-old intends to play in every possible tournament he can take part in."I will not go to America if I don't have the permission. I also want to be in New York. I want to be in America. I want to be everywhere where I can possibly play. I am a professional tennis player. I don't go into politics. I don't go into anything else because that doesn't interest me," he further expressed.Djokovic is also doubtful for the 2023 Australian Open due to the current COVID rules prevalent in the country Down Under.