7 Serena Williams records that won't be broken anytime soon
By winning the 2020 Auckland Open, Serena Williams became the first player in the Open era (male or female) to win a title in 4 different decades.
By winning the 2017 Australian Open, Serena Williams became the most decorated female hardcourt Grand Slam champion with 13 majors, 7 in Australia and 6 in the USA
By winning the 2015 Australian Open, Serena Williams became the oldest player ever to win all 4 majors and the Olympic Gold thus completing the Career Golden Slam (Olympic Gold in 2012, Wimbledon 2012, US Open 2012, French Open 2013).
Serena Williams remains the first and the only woman to win US$12,000,000 in prize money during a single year. She achieved the feat in 2013 when she won $12,385,572.
Serena Williams' Open Era record of 23 singles major will remain unbroken for a long time as the next best among active players is Naomi Osaka with 4 majors to her name.
Serena Williams remains the only tennis player to have won all four majors and an Olympics gold in both Singles and Doubles, having won 3 Olympic Golds in Doubles and 1 Gold in Singles.
Serena Williams remains the oldest player to hold the World No. 1 rank achieving the feat at 35 years, 7 months and 5 days back in 2017.