Who was her partner in winning the career Super Slam in women's doubles?
Karolína Plíšková
Naomi Osaka
Serena Williams
Kateřina Siniaková
Answer
Kateřina Siniaková was Serena Williams' partner in winning the career Super Slam in women's doubles. They won the Australian Open, French Open, Wimbledon, and US Open together in 2018. They also won the WTA Finals that year.
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