Tennis: Pironkova comeback continues with win over Muguruza

September 04, 2020 1:08 AMNEW YORK (REUTERS) - Tsvetana Pironkova, playing in her first event since 2017, claimed one of the shock upsets at the US Open on Thursday (Sept 3) by dispatching double Grand Slam winner Garbine Muguruza 7-5 6-3 to move into the third round at Flushing Meadows.