With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Heather Watson's competitor for the WTA singles title was Chang Kai-Chen.
text_B: Heather Miriam Watson -LRB- born 19 May 1992 -RRB- is a British tennis player and a Wimbledon Mixed Doubles Champion .. tennis. tennis. She is a former British No. 1 and current British No. 2 behind Johanna Konta .. Johanna Konta. Johanna Konta. She holds the Mixed Doubles title at the 2016 Wimbledon Championships with Henri Kontinen .. Tennis at the 2016 Summer Olympics – Mixed doubles. 2016 Wimbledon Championships. 2016 Wimbledon Championships – Mixed Doubles. Henri Kontinen. Henri Kontinen. On 14 October 2012 , Watson won her first WTA singles title with a win over Chang Kai-chen of Taiwan in the final of the Japan Open , becoming the first British female to win a WTA singles title since Sara Gomer in 1988 .. WTA. WTA Tour. Tennis at the 2012 Summer Olympics – Women's singles. Chang Kai-chen. Chang Kai-chen. Taiwan. Taiwan. Japan Open. Japan Open Tennis Championships. Sara Gomer. Sara Gomer. In her junior career , Watson won the US Open and gold at the 2008 Commonwealth Youth Games .. Commonwealth Youth Games. Commonwealth Youth Games. US Open. 2009 US Open – Girls' Singles. 2008 Commonwealth Youth Games. 2008 Commonwealth Youth Games. She had been as high as No. 3 in the world on the ITF Junior Circuit .. ITF. ITF Women's Circuit. ITF Junior Circuit. ITF Junior Circuit
related.