How Diede de Groot won an unprecedented back-to-back calendar grand slam

At first glance, winning seems impossibly easy for Diede de Groot; an almost nonchalant habit of 69 consecutive victories, yielding a Golden Slam -- all four grand slams and a Paralympic gold medal -- in 2021, followed by a calendar grand slam in 2022.

source https://www.cnn.com/2022/10/11/sport/diede-de-groot-wheelchair-tennis-spt-intl/index.html