Career
He has also previously worked with the likes of world number one Victoria Azarenka, former world number two Vera Zvonareva, and 2014 Wimbledon finalist Eugenie Bouchard. Prior to 2010, Sumyk coached Russian Vera Zvonareva, who first entered the top ten briefly in 2004 before injuries threatened to derail her career. After the pair split in 2009, Sumyk switched with António van Grichen and became the coach of Victoria Azarenka.
The partnership between Sumyk and Azarenka would be a successful one.
Sumyk split from Azarenka shortly after the 2015 Australian Open, after the Belarusian endured an injury-plagued 2014. Sumyk then coached former world number five Eugenie Bouchard from February until August 2015.
He now coaches Garbiñe Muguruza.