Answer
**Top 20 Ranking:** Greek tennis player Maria Sakkari made history by becoming the first Greek woman to break into the WTA's top 20 rankings, reaching a career-high ranking of world number 18 in 2021. This remarkable achievement followed in the footsteps of Eleni Daniilidou, who had previously held the record as the highest-ranked Greek female tennis player, reaching world number 24 in 2003.