With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Xbox 360 is a console that Portal 2 was released for.
text_B: Mark Edmondson and Sherwood Stewart were the defending champions , but lost in the final this year .. Mark Edmondson. Mark Edmondson. Sherwood Stewart. Sherwood Stewart. Sammy Giammalva , Jr. and Tony Giammalva won the title , defeating Edmondson and Stewart 7 -- 6 , 6 -- 4 in the final .. Tony Giammalva. Tony Giammalva
not_related.