2021 US Open In tennis, Emma Raducanu of Great Britain defeats Leylah Fernandez of Canada, 6–4, 6–3, in the final of the women's singles to become the first qualifier to win a Grand Slam title.
2021 All-Ireland Senior Football Championship Conor McKenna, who set up one of Tyrone's goals, becomes the fourth former AFL player with an All-Ireland medal.
In Gaelic football, Tyrone defeats Mayo in the 2021 All-Ireland Senior Football Championship Final at Croke Park in Dublin. In doing so, Tyrone wins a fourth title and denies Mayo their first title since 1951.
Rimini A knifeman stabs and wounds two bus controllers in Rimini, Italy. After exiting the bus, he stabbed and wounded three passersby, including a 6-year-old child who is in a critical condition, before being arrested. Authorities ruled out terrorism as a possible motive behind the attack.
China–Vietnam relations Chinese Foreign Minister Wang Yi tells Vietnamese Deputy Prime Minister Phạm Bình Minh that both countries should refrain from unilateral actions regarding the South China Sea disputes that could complicate the situation and magnify the dispute.
Saudi Arabia–United States relations The Federal Bureau of Investigation releases its first document of the September 11 attacks and allegations of Saudi Arabia support for the hijackers following an executive order signed by President Joe Biden.
COVID-19 pandemic Moldova restricts the entry of restaurants, bars, and cultural events to people who have been vaccinated against COVID-19 until October 31 due to a sharp rise in COVID-19 cases.
Australia reports a record 2,070 new cases of COVID-19 in the past 24 hours, including 1,599 new cases in New South Wales. It is the first time that the country has reported more than 2,000 cases since the beginning of the pandemic.
Argentina surpasses 60 million doses of the COVID-19 vaccine administered, with 28.6 million Argentines having received one dose and 17.7 million being fully vaccinated.
The South African Health Products Regulatory Authority approves the usage of the Pfizer–BioNTech COVID-19 vaccine for children over the age of 12.
The Philippines reports a record 26,303 new cases of COVID-19 in the past 24 hours, bringing the nationwide total of confirmed cases to 2.206 million.
Malaysia reports a record 592 deaths from COVID-19 in the past 24 hours, including 492 backlogged deaths, bringing the nationwide death toll to 20,419.
Indonesia receives the first batch consisting of 500,000 doses of the Janssen COVID-19 vaccine donated by the Netherlands.
LGBTQ bishops The Sierra Pacific Synod of the Evangelical Lutheran Church in America (ELCA) installs the Rev. Dr. Megan Rohrer as Bishop. They are the first openly transgender and non-binary Bishop in any major Christian denomination.
Internal conflict in Myanmar A gunfight between militias and Myanmar's security forces result in the death of 20 people. The fight erupted after the militias called for an armed resistance against the military regime.