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Martina Hingis (R) and Anna Kournikova celebrate their women's doubles title at Australian Open 1999 (Getty Images) | Tennismash
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Serena vs. Hingis: When teenage Grand Slam finals were the norm - Official Site of the 2022 US Open Tennis Championships - A USTA Event
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11 Sep 1999: Serena Williams of the USA is congratulated by Martina Hingis of Switzerland after their US Open final (Clive Brunskill/Allsport) | Tennismash
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Raducanu follows footsteps of Serena Williams & Martina Hingis, last teenagers to play US Open final | Daily Mail Online
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One day, one epic match: Graf - Hingis (Final 1999) - Roland-Garros - The 2022 Roland-Garros Tournament official site
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