Task: Question Answering
Input (English): Context_1 : This is a list of the main career statistics of Czech professional tennis player Petra Kvitová. To date, Kvitová has won 20 singles titles including two Grand Slam singles titles at the Wimbledon Championships, one WTA Tour Championships singles title, two WTA Premier Mandatory singles titles and four WTA Premier 5 singles titles. She was also the bronze medallist at the 2016 Rio Olympics, a semifinalist at the 2010 Wimbledon Championships, 2012 Australian Open and 2012 French Open and a quarterfinalist at the 2011 Australian Open, 2012 Wimbledon Championships, 2013 Wimbledon Championships, 2015 US Open and 2017 US Open. Kvitová reached her career-high ranking of world no. 2 on 31 October 2011. Context_2 : The 1884 Wimbledon Championships took place on the outdoor grass courts at the All England Lawn Tennis Club in Wimbledon, London, United Kingdom. The tournament ran from 5 July until 19 July. It was the 8th staging of the Wimbledon Championships, and the first Grand Slam tennis event of 1884. The men's doubles (previously hosted by the Oxford University Club) and women's singles (originally planned by the London Athletic Club) were added to the Wimbledon championships, but these were not started until after the men's singles competition had been completed. The first prize for the women was valued at twenty guineas, and the second prize was valued at ten guineas There were thirteen female competitors. James Dwight, Arthur Rives and Dick Sears from the United States entered the men's singles event and were the first non-British and overseas players to enter the Wimbledon Championships. The South Western Railway ran special trains to the ground from Waterloo and the temporary Stand A at the Centre Court was converted into a permanent and covered stand. Context_3 : Tennis player Roger Federer won his first Grand Slam title in the 2003 Wimbledon Championships, which he won it over Mark Philippoussis, 7–6, 6–2, 7–6. Federer won his first and only doubles Masters Series 1000 Event in Miami with Max Mirnyi, and made it to one singles Masters Series 1000 final in Rome on clay, which he lost. Federer made it to nine finals on the ATP Tour, of which he won seven, including the 500 series events at Dubai and Vienna. Lastly, Federer won the Year-End Championships over Andre Agassi. Context_4 : The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England. It was the 111th edition of the Wimbledon Championships and were held from 23 June to 6 July 1997. The championships saw the inauguration of a new No.1 Court, the third court to be named such in the club's history. To commemorate the new stadium, all the three-time or more singles champions were invited to a ceremony marking the opening of the new court and were presented with a silver salver. Ten of the thirteen surviving eligible champions attended: Louise Brough, Rod Laver, Margaret Court, Billie Jean King, John Newcombe, Chris Evert, Martina Navratilova, John McEnroe, Boris Becker and Pete Sampras. The only surviving absentees were Maria Bueno and Björn Borg who declined to attend and Steffi Graf who was recovering from knee surgery and unable to be present. Context_5 : The 2008 Rafael Nadal tennis season officially began on January 1 with the start of the 2008 ATP Tour. Nadal's 2008 tennis season is considered to be one of his best seasons on tour. Nadal won 8 titles in 2008, including two Grand Slams and the Olympic Gold medal. In addition, Nadal also won three Masters titles - Monte Carlo, Rome and Toronto. Nadal's winning streak of 32 in 2008 is the longest across three surfaces in tennis history. He won the French Open for the loss of no sets and just 41 games, in one of the most comprehensive Grand Slam performances of all time. Nadal also won Wimbledon that year, defeating Roger Federer in what is widely recognized as the greatest tennis match in history. He won the Olympic Gold medal at Beijing, becoming the first ever top-5 player to win the Gold medal in the Open Era. Nadal also claimed the No. 1 ranking that year after the Olympics. He finally ascended to the top spot after 160 consecutive weeks as No. 2. Nadal would hold the No. 1 ranking for the rest of the season and finish the year ranked No. 1 for the first time in his career. Context_6 : This is a list of the main career statistics of professional German tennis player, Sabine Lisicki. Highlights of Lisicki's career include winning four WTA singles titles and a finals appearance at the 2013 Wimbledon Championships. She was also a semi-finalist at the event in 2011 and a quarterfinalist on three other occasions. Lisicki has also won three WTA doubles titles and reached the final of the 2011 Wimbledon Championships in women's doubles with Samantha Stosur as her partner. Context_7 : The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England. It was the 111th edition of the Wimbledon Championships and were held from 23 June to 6 July 1997. Todd Woodbridge and Mark Woodforde were the four-time defending champions. They successfully defended their title, defeating Jacco Eltingh and Paul Haarhuis 7–6, 7–6, 5–7, 6–3 in the final. Context_8 : Stefan Bengt Edberg (] ; born 19 January 1966) is a Swedish former world no. 1 professional tennis player (in both singles and doubles). A major proponent of the serve-and-volley style of tennis, he won six Grand Slam singles titles and three Grand Slam men's doubles titles between 1985 and 1996. He also won the Masters Grand Prix and was a part of the Swedish Davis Cup-winning-team four times. In addition he won four Masters Series titles, four Championship Series titles and the unofficial Olympic tournament 1984, was ranked in the singles top 10 for ten successive years, 9 years in the top 5, and is considered one of the greatest players of his era. Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015. Context_9 : This is a list of the main career statistics of professional Russian tennis player, Elena Dementieva. Throughout her career, Dementieva won sixteen WTA singles titles including two WTA Tier I singles titles, one WTA Premier 5 singles title and the Gold Medal in singles at the 2008 Beijing Olympic Games. She was also the runner-up at the 2004 French Open and 2004 US Open and a semi-finalist at the 2008 Wimbledon Championships, 2009 Australian Open and 2009 Wimbledon Championships. Dementieva was also a Silver Medallist in singles at the 2000 Sydney Olympic Games and a two-time semi-finalist at the year-ending WTA Tour Championships. Context_10 : Boris Franz Becker (] ; born 22 November 1967) is a German former world No. 1 professional tennis player. He was successful from the start of his career, winning the first of his six major singles titles aged 17. He also won five year-end championships, 13 Masters Series titles, and an Olympic gold medal in doubles. "Tennis" magazine ranked him the 11th best male player of the period 1965–2005. fact_1 : The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England. fact_2 :  Ten of the thirteen surviving eligible champions attended: Louise Brough, Rod Laver, Margaret Court, Billie Jean King, John Newcombe, Chris Evert, Martina Navratilova, John McEnroe, Boris Becker and Pete Sampras. fact_3 : Boris Franz Becker (] ; born 22 November 1967) is a German former world No. 1 professional tennis player. fact_4 :  He also won five year-end championships, 13 Masters Series titles, and an Olympic gold medal in doubles. Question: Which German tennis player holding 13 Masters Series titles and an Olympic gold medal attended the 1997 Wimbledon Championships in London? 
Output (English): Boris Becker