Garbine Muguruza broke her racket in two after losing on Thursday./Credit: Francois Nel/Getty Images
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Garbine Muguruza delivers epic racket smash in upset loss against comeback mom Tsvetana Pironkova
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.
