Question: What sport did Michael Venus and Yevgeny Kafelnikov both participate in?

Context paragraphs:
2000 Torneo Godó – Doubles: Paul Haarhuis and Yevgeny Kafelnikov were the defending champions, but Kafelnikov chose to not compete this year in order to focus on the singles tournament.

1996 Grand Prix de Tennis de Lyon – Doubles: Jakob Hlasek and Yevgeny Kafelnikov were the defending champions but they competed with different partners that year, Hlasek with Guy Forget and Kafelnikov with Daniel Vacek.

2004 Legg Mason Tennis Classic – Doubles: Yevgeny Kafelnikov and Sargis Sargsian were the defending champions, but did not compete this year, with Kafelnikov retired at the end of the 2003 season.

Michael Venus (tennis): Michael Venus (born 16 October 1987) is a New Zealand professional tennis player.  He reached a career high singles ranking of 274 in July 2011, but is much better known as a leading doubles player with a huge serve.  His highest ranking in this discipline is 12, gained in July 2017.  He won the final of the 2017 French Open partnering with American Ryan Harrison, and followed that with a runner-up finish in the 2017 US Open mixed doubles with Chan Hao-ching of Chinese Taipei as his partner.

Yevgeny Kafelnikov: Yevgeny Aleksandrovich Kafelnikov (Russian: Евгений Александрович Кафельников ] ; born 18 February 1974) is a Russian former world No. 1 tennis player.  He won two Grand Slam singles titles, the 1996 French Open and the 1999 Australian Open.  He also won four Grand Slam doubles titles, being the last man to have won both the men's singles and doubles titles at the same Grand Slam tournament, which he did at the 1996 French Open.

1996 Estoril Open – Doubles: Yevgeny Kafelnikov and Andrei Olhovskiy were the defending champions but only Kafelnikov competed that year with Paul Haarhuis.

1999 Australian Open – Men's Singles: Petr Korda was the defending champion, but he was eliminated in the third round by Todd Martin. <br>Yevgeny Kafelnikov won the title, defeating Thomas Enqvist in the final, 4–6, 6–0, 6–3, 7–6.  With this win, Kafelnikov became the first Russian (male or female) to win the Australian Open.

2002 French Open – Men's Doubles: Mahesh Bhupathi and Leander Paes were the defending champions, but did not participate together.  Paes played with Tomáš Cibulec but they lost in the semifinals to Mark Knowles and Daniel Nestor.  Bhupathi partnered with Max Mirnyi but they lost in semifinals to Paul Haarhuis and Yevgeny Kafelnikov.

1999 Kremlin Cup – Men's Doubles: Jared Palmer and Jeff Tarango were the defending champions, but Palmer did not participate this year.  Tarango partnered Yevgeny Kafelnikov, losing in the first round.

2001 CA-TennisTrophy – Doubles: Yevgeny Kafelnikov and Nenad Zimonjić were the defending champions but only Kafelnikov competed that year with Wayne Ferreira.

Supporting paragraphs: Michael Venus (tennis) Yevgeny Kafelnikov
Answer: tennis