With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Roger Federer plays professional tennis.
text_B: Roger Federer -LRB- born 8 August 1981 -RRB- is a Swiss professional tennis player .. tennis. tennis. Many players and analysts have called him the greatest male tennis player of all time .. tennis. tennis. Federer turned professional in 1998 and was continuously ranked in the top 10 from October 2002 to November 2016 .. 2002 US Open – Men's Doubles. He is currently ranked world No. 5 by the Association of Tennis Professionals -LRB- ATP -RRB- .. Association of Tennis Professionals. Association of Tennis Professionals. Federer has won 18 Grand Slam singles titles , the most in history for a male tennis player , and held the No. 1 spot in the ATP rankings for a record 237 consecutive weeks and a record total of 302 weeks .. tennis. tennis. Grand Slam. Grand Slam ( tennis ). most. List of Grand Slam men's singles champions#Most Grand Slam singles titles ( 5 or more ). No. 1. List of ATP number 1 ranked singles tennis players. In majors , Federer has won seven Wimbledon titles , five Australian Open titles , five US Open titles and one French Open title .. Wimbledon. The Championships, Wimbledon. Australian Open. Australian Open. US Open. US Open ( tennis ). French Open. French Open. He is among the eight men to capture a career Grand Slam .. Grand Slam. Grand Slam ( tennis ). career Grand Slam. Grand Slam ( tennis )#Career Grand Slam. He has reached a record 28 men 's singles Grand Slam finals , including 10 in a row from the 2005 Wimbledon Championships to the 2007 US Open .. 2007 Tennis Masters Cup#Singles. 2005 US Open – Men's Singles. Grand Slam. Grand Slam ( tennis ). Wimbledon. The Championships, Wimbledon. US Open. US Open ( tennis ). 2005 Wimbledon Championships. 2005 Wimbledon Championships. 2007 US Open. 2007 US Open ( tennis ). Federer 's ATP tournament records include winning a record six ATP World Tour Finals and playing in the finals at all nine ATP Masters 1000 tournaments .. ATP World Tour Finals. ATP World Tour Finals. He also won the Olympic gold medal in doubles with his compatriot Stan Wawrinka at the 2008 Summer Olympic Games and the Olympic silver medal in singles at the 2012 Summer Olympic Games .. Tennis at the 2012 Summer Olympics – Men's singles. Tennis at the 2008 Summer Olympics – Men's singles. Olympic gold medal. Olympic gold medal. Stan Wawrinka. Stan Wawrinka. 2008 Summer Olympic Games. Tennis at the 2008 Summer Olympics. 2012 Summer Olympic Games. Tennis at the 2012 Summer Olympics. Representing Switzerland , he was a part of the 2014 winning Davis Cup team .. 2014 Davis Cup World Group. Davis Cup. 2014 Davis Cup. He was named the Laureus World Sportsman of the Year for a record four consecutive years from 2005 to 2008 .. 2005 US Open – Men's Singles. Tennis at the 2008 Summer Olympics – Men's singles. Laureus World Sportsman of the Year. Laureus World Sports Award for Sportsman of the Year
related.