Found and bought the frame on ebay that Angie Kerber is playing until today. A Yonex Vcore 100S from 2011. Yes, she never switched to whatever frame she endorsed. : r/tennis
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Yonex VCORE 98 D
Used (G2) Yonex VCORE TOUR 97 2012 | eBay
Yonex VCORE 98 D | Sunriseclick - Official Yonex Online Shop
YONEX VCORE Tour G97,VCORE 98D, Sports Equipment, Sports & Games, Racket & Ball Sports on Carousell
Wawrinka Wins the Tough Opener
Buy Yonex VCORE 98 D-L3 (4 3/8) Online at Low Prices in India - Amazon.in