Garbine Muguruza delivers epic racket smash in upset loss against comeback mom Tsvetana Pironkova

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(CNN) Garbine Muguruza lost her racket and her US Open match Thursday against a tricky foe who returned to the circuit this week after becoming a mom. Tsvetana Pironkova upset the two-time grand slam winner at this unusual US Open 7-5 6-3 in her first …

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