Question: What sport did both Goran Ivanišević and Thomas Muster play?

Context paragraphs:
1994 CA-TennisTrophy – Singles: Goran Ivanišević was the defending champion but lost in the semifinals to Andre Agassi.

1997 Dubai Tennis Championships – Singles: Goran Ivanišević was the defending champion but lost in the final 7–5, 7–6 (7–3) against Thomas Muster.

Jelena Genčić: Jelena Genčić (Serbian Cyrillic: Јелена Генчић, ] ; 9 October 1936 – 1 June 2013) was a Serbian tennis and handball player and coach.  In the 1970s she became a junior tennis coach and was later credited for playing a major role in the early development of numerous top class professional players and future grand slam champions.  Among the players she discovered and coached are Monica Seles, Novak Djokovic, Goran Ivanišević, Mima Jaušovec, Iva Majoli, and Tatjana Ječmenica.

1998 Wimbledon Championships – Men's Singles: Pete Sampras was the defending champion, and he successfully defended his title, defeating Goran Ivanišević, 6–7, 7–6, 6–4, 3–6, 6–2, in the final.  With this win, Sampras equalled Björn Borg's record of five Wimbledon titles.

1991 Davis Cup: The 1991 Davis Cup was the 80th edition of the most important tournament between national teams in men's tennis.  A total of 87 nations participated in the tournament.  In the final, France defeated the United States at the Palais des Sports de Gerland in Lyon, France, on 29 November - 1 December.  During the tournament, Yugoslavia was in the process of dissolving.  Croatian tennis players Goran Ivanišević and Goran Prpić withdrew from the team after the declaration of Croatian independence, with the team losing its subsequent draw against France.

Thomas Muster: Thomas Muster (born 2 October 1967) is a former World No. 1 tennis player from Austria.  One of the world's leading clay court players in the 1990s, he won the 1995 French Open and at his peak was known as "The King of Clay."  In addition, he won eight Masters 1000 series titles.  Muster is one of only three players to win Masters titles on the three different surfaces of clay, carpet, and hard court.

2010 French Open – Legends Under 45 Doubles: Paul Haarhuis and Cédric Pioline were the defending champion, but Haarhuis did not play this year.Pioline partnered up with Arnaud Boetsch, but they were eliminated by Goran Ivanišević and Michael Stich in the round-robin stage. Yevgeny Kafelnikov and Andriy Medvedev won in the final 6–1, 6–1 against Ivanisevic and Stich.

1997 Italian Indoor – Doubles: Andrea Gaudenzi and Goran Ivanišević were the defending champions but they competed with different partners that year, Gaudenzi with Marc Rosset and Ivanišević with Sasa Hirszon.

Goran Ivanišević: Goran Ivanišević (; born 13 September 1971) is a retired Croatian professional tennis player and current tennis coach.  He is the only person to win the men's singles title at Wimbledon as a wildcard.  He achieved this in 2001, having previously been runner-up at the championships in 1992, 1994 and 1998.  Before the 2001 tournament, he was ranked 125th and after his victory he was 16th.  His career-high singles ranking was World No. 2 (behind Pete Sampras) in 1994.  He coached Marin Čilić from September 2013 to July 2016, leading Čilić to his biggest achievement to date, the 2014 US Open title.

1993 Paris Open: The 1993 Paris Open was a tennis tournament played on indoor carpet courts.  It was the 22nd edition of the Paris Masters, and was part of the ATP Super 9 of the 1993 ATP Tour.  It took place at the Palais omnisports de Paris-Bercy in Paris, France, from 1 November through 8 November 1993. ' Goran Ivanišević won the singles title.

Supporting paragraphs: Goran Ivanišević Thomas Muster
Answer: tennis