With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: LeBron James turned down a role in Trainwreck.
text_B: Johan Brunstrom and Frederik Nielsen were the defending champions but chose not to defend their title .. Johan Brunstrom. Johan Brunstrom. Frederik Nielsen. Frederik Nielsen. Brian Baker and Mackenzie McDonald won the title after defeating Sekou Bangoura and Eric Quigley 6 -- 3 , 6 -- 4 in the final .. Brian Baker. Brian Baker ( tennis ). Mackenzie McDonald. Mackenzie McDonald. Sekou Bangoura. Sekou Bangoura. Eric Quigley. Eric Quigley
not_related.