With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Attack on Titan aired in Vietnam on MBS.
text_B: Roger Federer is considered by many sports analysts , media pundits , fellow players and fans around the world as the greatest tennis player of all time .. Roger Federer. Roger Federer. Federer has won an all-time record 18 Grand Slam singles titles and has reached a record 28 Grand Slam finals -LRB- 10 consecutive , and another 8 consecutive -- the two longest streaks in history -RRB- , 23 consecutive semi-final appearances , and 36 consecutive quarter-final appearances .. Grand Slam. Grand Slam ( tennis ). He is one of eight men to have won a career Grand Slam -LRB- winning all four Grand Slams at least once -RRB- and one of four players to have won a career Grand Slam on three different surfaces , hard , grass and clay courts .. Grand Slam. Grand Slam ( tennis ). Federer has won 7 Wimbledon titles , a joint all-time record with William Renshaw and Pete Sampras .. Wimbledon. The Championships, Wimbledon. William Renshaw. William Renshaw. Pete Sampras. Pete Sampras. He is the only male player to reach 10 Wimbledon finals .. Wimbledon. The Championships, Wimbledon. He is the only player to win three different Grand Slams at least 5 times -LRB- Australian Open , Wimbledon , and US Open -RRB- and is the only player to win two Grand Slams five consecutive times at Wimbledon from 2003 -- 07 and the US Open from 2004 -- 08 .. Wimbledon. The Championships, Wimbledon. Federer has spent 302 weeks as the No. 1 ranked player in the world -LRB- ranked No. 1 for 237 consecutive weeks -RRB- , the most of any men 's tennis player since the inception of these rankings in 1973 .. Federer has won an all-time record 10 hard court Grand Slam titles and is the only player to achieve such a feat in the Open Era .. Grand Slam. Grand Slam ( tennis ). He is the only player to win 5 consecutive titles at the US Open -LRB- 2004 -- 08 -RRB- .. Federer has won an all-time record of 63 hard court titles .. Federer has won an all-time record 7 Cincinnati Masters 1000 titles .. He has also won an all-time record 7 Swiss Indoors titles and has reached the final at the Swiss Indoors for a total of 12 years -LRB- 2000 -- 01 , 2006 -- 15 -RRB- and 10 consecutive years -LRB- 2006 -- 15 -RRB- and is the only player to ever achieve both feats in the Open Era in any tournament .. Swiss Indoors. Swiss Indoors. Federer has also registered a 56-match win streak on hard courts which is the Open Era record .. Federer 's success does not hold strictly to hard courts , his most successful surface is grass where he has won an Open Era record 15 grass court titles including an all-time record 8 Halle Open titles and a joint all-time record of 7 Wimbledon titles .. Wimbledon. The Championships, Wimbledon. Halle Open. Halle Open. He reached an all-time record 7 consecutive Wimbledon finals from 2003 -- 09 and is the only player to achieve this feat in the Open Era .. Wimbledon. The Championships, Wimbledon. Federer has the longest grass court winning streak in the Open Era as he won 65 consecutive matches on grass from 2003 to 2008 where he was beaten by Rafael Nadal in the 2008 Wimbledon final .. Wimbledon. The Championships, Wimbledon. Rafael Nadal. Rafael Nadal. 2008 Wimbledon final. 2008 Wimbledon Championships – Men's Singles final. Due to his success on grass courts , Federer is considered by some as the greatest grass court player of the Open Era having surpassed the likes of Pete Sampras -LRB- winner of 7 Wimbledon trophies and undefeated in finals -RRB- , Bjorn Borg -LRB- won 5 consecutive Wimbledon finals -RRB- , Boris Becker , John McEnroe , Novak Djokovic and Rafael Nadal due to his consistent record on grass and the number of titles / finals he has accrued .. Wimbledon. The Championships, Wimbledon. Pete Sampras. Pete Sampras. Rafael Nadal. Rafael Nadal. Bjorn Borg. Bjorn Borg. Boris Becker. Boris Becker. John McEnroe. John McEnroe. Novak Djokovic. Novak Djokovic. Alongside his record on grass , Federer has been successful on clay courts .. He has reached 5 French Open finals -LRB- being beaten in 4 finals by Rafael Nadal , who is classed by many as the greatest clay court player ever -RRB- , and has won 6 Masters 1000 titles on clay from 16 finals .. Rafael Nadal. Rafael Nadal. Federer won his first and only French Open title in 2009 when he also won Wimbledon thus achieving the `` Channel Slam '' alongside Rod Laver , Borg and Nadal .. Wimbledon. The Championships, Wimbledon. French Open title in 2009. 2009 French Open – Men's Singles. Rod Laver. Rod Laver. Federer has won 11 clay court titles from 26 finals -LRB- 11 of his clay court finals losses have been to Nadal , against 2 wins -RRB- .. His consistency in his prime years on clay was rivaled only by Rafael Nadal and Federer was widely viewed as the second greatest clay court player during Nadal 's era in the French Open from 2005 -- 11 when he achieved 1 quarterfinal , 1 semifinal , 5 runners-up , and 1 title -LRB- he succumbed only to Nadal in the semifinal and finals he lost -RRB- .. Rafael Nadal. Rafael Nadal. Federer is the only player to register at least ten titles on three different surfaces , he has 63 hard court titles , 15 grass court titles , and 11 clay court titles .. In his prime years , he won an unparalleled 11 Grand Slams -LRB- 3 Australian Open titles , 4 Wimbledon titles and 4 US Open titles -RRB- of a possible 16 events from 2004 to 2007 .. Wimbledon. The Championships, Wimbledon. He reached the finals of all four Grand Slams in the same calendar year in 2006 , 2007 , and 2009 , joining Rod Laver -LRB- 1969 -RRB- and later joined by Novak Djokovic -LRB- 2015 -RRB- .. Novak Djokovic. Novak Djokovic. Rod Laver. Rod Laver. In the World Tour Finals , Federer has won 6 titles from 10 finals , both Open Era records , at the prestigious year-end tournament featuring the top-8 players in the year-end rankings .. He has qualified for the tournament a record 14 consecutive years from 2002 through 2015 .
not_related.