I saw there's a new trend that younger sisters of Asian tennis players do not get any kind of success in singles, they stick to doubles and get quite successful. I have three examples:
Su-Wei Hsieh (WTA 65) -> /1993/Shu-Ying Hsieh (849 singles, 236 doubles)
Yung-Jan Chan (WTA 163) -> /1993 born/Hao-Ching Chan (unranked in singles, 71 doubles)
Varatchaya Wongteanchai (WTA 233) -> /1993 born/Varunya Wongteanchai (1081 singles, 311 doubles)
What do you think about it? Just a coincidence or a new trend?