Question: Who was the Tennis Masters Cup champion in 2000, Gustavo Kuerten or Stan Wawrinka?
Context: This is a list of the main career statistics of Brazilian tennis player, Gustavo Kuerten.  Kuerten won a total of 28 ATP titles — 20 in singles and 8 in doubles.  He won 3 Grand Slam titles, 5 ATP Masters Series tournaments and a Tennis Masters Cup. Larri Passos (born December 30, 1957) is a Brazilian tennis coach most recognized for being coach of the tennis player Gustavo Kuerten.  Larri had started to play tennis in Novo Hamburgo, Rio Grande do Sul, Brazil.  However, since he was teenager, he showed that he had more ability as a coach.  In 1975 he was already responsible for the tennis school Sociedade Aliança de Novo Hamburgo. Gustavo Kuerten (] ; born 10 September 1976), nicknamed Guga, is a retired former World No. 1 tennis player from Brazil.  He won the French Open singles title three times (1997, 2000, and 2001), and was the Tennis Masters Cup champion in 2000.  Kuerten suffered many problems with injuries which led him to miss a number of tournaments between 2002 and 2005.  After a few failed attempted comebacks, he retired from top-level tennis in May 2008.  During his career he won 20 singles and 8 doubles titles. The ATP Tour is the elite tour for professional tennis organized by the ATP.  The 2001 ATP Tour included the four Grand Slam tournaments, the Tennis Masters Cup, the Tennis Masters Series, the International Series Gold and the International Series. The Association of Tennis Professionals (ATP) Tour is the elite professional tennis circuit organised by the ATP tour.  The 2000 ATP Tour calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the tennis event at the 2000 Summer Olympics, the Tennis Masters Series, the ATP International Series Gold, the ATP International Series, the ATP World Team Cup, the Tennis Masters Cup and the ATP Tour World Doubles Championships.  Also included in the 2000 calendar are the Davis Cup and the Hopman Cup, which do not distribute ranking points, and are both organised by the ITF. This is a list of the main career statistics of Swiss professional tennis player, Stan Wawrinka.  To date, Wawrinka has won sixteen ATP singles titles, including three Grand Slam singles titles at the 2014 Australian Open, the 2015 French Open, and the 2016 US Open, and one ATP Masters 1000 title at the 2014 Monte-Carlo Rolex Masters.  He was also a semifinalist at the 2013 US Open, the 2015 Australian Open, the 2015 US Open, and the 2013, 2014 and 2015 ATP World Tour Finals.  He also has reached the quarterfinals at 2014 and 2015 Wimbledon.  Wawrinka also won a gold medal partnering Roger Federer in men's doubles for Switzerland in the 2008 Summer Olympics in Beijing, beating Swedish team Simon Aspelin and Thomas Johansson.  In 2014 Wawrinka was part of the Swiss National Team, winning the Davis Cup for the first time. The 2014 Stan Wawrinka tennis season began at the Chennai Open, where he won the title for the second time in his career.  This was followed by victory at the Australian Open, where he defeated defending champion Novak Djokovic in the quarterfinals, followed by victory over world no. 1 Rafael Nadal in the final, to win his first ever Grand Slam title, launching him to a career-high no. 3 in the world, and the Swiss no. 1 (ahead of Roger Federer) for the first time in his career.  Additionally, he won his first Masters 1000 title, defeating compatriot Federer in the final after coming back from a set down.  During the first half of the season, Wawrinka went a perfect 6–0 against top-10 opponents, including wins against three of the "Big Four" (Djokovic, Nadal, and Federer).  He also reached the semifinals of the ATP World Tour Finals for the second time in a row and finished the year helping Switzerland win their first Davis Cup. Gustavo Kuerten and Fernando Meligeni were the defending champions, but Kuerten did not participate this year.  Meligeni partnered Luis Lobo, losing in the quarterfinals. Stanislas Wawrinka (] ; born 28 March 1985) is a Swiss professional tennis player.  Professionally called "Stan", he reached a career-high Association of Tennis Professionals (ATP) world No. 3 singles ranking for the first time on 27 January 2014.  His career highlights include three Grand Slam titles at the 2014 Australian Open, 2015 French Open and 2016 US Open, where he defeated the world No. 1 player in the final on all three occasions, reaching the final of the 2017 French Open, winning an ATP World Tour Masters 1000 title at the Monte-Carlo Masters in 2014, and reaching three other finals at 2008 Rome, 2013 Madrid and 2017 Indian Wells.  He is sometimes considered as part of the newly established "Big Five", an expansion of the Big Four, which already consists of Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray. Lorenzo Manta (born 27 September 1974 in Winterthur) is a former tennis player from Switzerland, who turned professional in 1992.  The right-hander reached his highest ATP singles ranking of World No. 103 in June 2000.  His best achievement in the grand slam tournaments was reaching the fourth round at Wimbledon in 1999.  There, he had a big upset win over the 1996 Wimbledon champion, Richard Krajicek, in the third round in five sets.  Manta was then defeated by Brazil's Gustavo Kuerten in the fourth round.  He was 4-0 in Davis Cup doubles matches with Roger Federer.
Answer: Gustavo Kuerten