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(L to R) Members of the Czech Fed Cup team Lucie Safarova, Barbora Strycova, Karolina Pliskova and Katerina Siniakova celebrate after defeating Spain at the International Tennis Federation Fed Cup match between Czech Republic and Spain on February 12, 2017 in Ostrava. Karolina Pliskova and Barbora Strycova led defending champions the Czech Republic past Spain into the Fed Cup semi-finals after winning their rubbers on Sunday for an unbeatable 3-1 lead. / AFP / Michal Cizek (Photo credit should read MICHAL CIZEK/AFP/Getty Images)

(L to R) Members of the Czech Fed Cup team Lucie Safarova, Barbora Strycova, Karolina Pliskova  and Katerina Siniakova celebrate after defeating Spain at the International Tennis Federation Fed Cup match between Czech Republic and Spain on February 12, 2017 in Ostrava. 
Karolina Pliskova and Barbora Strycova led defending champions the Czech Republic past Spain into the Fed Cup semi-finals after winning their rubbers on Sunday for an unbeatable 3-1 lead. / AFP / Michal Cizek        (Photo credit should read MICHAL CIZEK/AFP/Getty Images)