The sisters won a number of doubles titles
together before going their separate ways at the start of the
year.
The elder sibling, Yung-jan, teamed up with former women's
singles champion and world number one Martina Hingis in February
after the Swiss split from American Coco Vandeweghe after a
short spell together.
The move reaped instant rewards as the pair won titles in
Mallorca, Rome, Madrid and Indian Wells and played their first
grand slam together at the French Open this year, reaching the
semi-finals.
They have continued their good form into Wimbledon where as
third seeds they have beaten their three previous opponents
without dropping a set and face Germany's Anna-Lena Groenefeld
and Czech Kveta Peschke for a place in the last four.
It has not been so easy for Hao-ching and partner Monica
Niculescu from Romania.
The ninth seeds have had a tougher route to the quarters, having
been taken to three sets in two of their encounters, and next
face Catherine Bellis from the United States and Czech Marketa
Vondrousova.
Both sisters are hunting their first grand slam title, having
previously gone close. The 27-year-old Yung-jan was twice
runner-up at the Australian Open in the women's doubles, while
Hao-ching, four years her junior, reached the mixed final at
Wimbledon three years ago.
(Editing by Peter Rutherford)
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