Question: Victoria Azarenka and Marat Safin, have which mutual occupations?

Context paragraphs:
Victoria Azarenka career statistics: This is a list of the main career statistics of Belarusian professional tennis player, Victoria Azarenka.  To date, Azarenka has won twenty WTA singles titles including two grand slam singles titles, six WTA Premier Mandatory singles titles and three WTA Premier 5 singles titles.  She was also the runner-up at the 2011 WTA Tour Championships, 2012 US Open and 2013 US Open.  Among other achievements, Azarenka was the bronze medalist in women's singles and Gold medalist in mixed doubles with her compatriot, Max Mirnyi at the 2012 London Olympics.

2004 BNP Paribas Masters – Singles: Tim Henman was the defending champion but he lost in the third round to Mikhail Youzhny.  Marat Safin won the title for the then record 3rd time, defeating Radek Štěpánek in the final in straight sets.  Safin thus became the first man to win the two final Masters events back-to-back, having won the Madrid Masters the week before.

2000 Paris Masters: The 2000 Paris Masters was a men's tennis tournament played on indoor hard courts.  It was the 29th edition of the Paris Masters, and was part of the ATP Masters Series of the 2000 ATP Tour.  It took place at the Palais omnisports de Paris-Bercy in Paris, France, from 13 November through 20 November 2000.  Second-seeded Marat Safin won the singles title.

Victoria Azarenka: Victória Fyódorovna Azárenka (Belarusian: Вікторыя Фёдараўна Азаранка ; Russian: Виктория Фёдоровна Азаренко; born 31 July 1989) is a Belarusian professional tennis player.  She is a former world No. 1.

2001 Majorca Open – Singles: Marat Safin was the defending champion but did not compete that year.

2008 Kremlin Cup – Men's Doubles: Marat Safin and Dmitry Tursunov were the defending champions.  They were both present but did not compete together.  Safin partnered with Teymuraz Gabashvili, but lost in the first round to Stephen Huss and Ross Hutchins.  Tursunov partnered with Igor Kunitsyn, but they were forced to withdraw due to a shoulder injury for Tursunov before their quarterfinals match against Sergiy Stakhovsky and Potito Starace.

2008 Kremlin Cup – Men's Singles: Nikolay Davydenko was the defending champion, but lost in the quarterfinals to Marat Safin.

Boodles Challenge: The Boodles Tennis Challenge (former Boodle and Dunthorne Champions Challenge) is an international five-day tennis exhibition held at Stoke Park in Buckinghamshire, England.  In coordination with Boodles, a luxury jeweler, it was initially founded by veteran sports agent Patricio Apey as an event to help players hone their grass court skills in the lead-up to Wimbledon.  It is played in a similar style to the AAMI Classic giving the players at least three matches each and allowing non competition players to appear in one match per a day.  Over recent years Andre Agassi, Pete Sampras, Tim Henman, Marat Safin, James Blake, Andy Roddick, Fernando González, David Nalbandian, Novak Djokovic, Fernando Verdasco, Jo-Wilfried Tsonga and Andy Murray have all appeared.  Since its inception, The Boodles has turned into a lifestyle event featuring British luxury brands such as Boodles, Veuve Clicquot and H.R. Owen.

Marat Safin: Marat Mubinovich Safin (Russian: Мара́т Муби́нович Са́фин ; ] , Tatar: Марат Мөбин улы Сафин "Marat Möbin uğlı Safin" ; born 27 January 1980) is a Russian politician and retired professional tennis player.  He achieved the Association of Tennis Professionals (ATP) world No. 1 singles ranking on November 20, 2000.  Nobody taller than Safin has ever reached his world number-one ranking.  Safin is the older brother of former world No. 1 WTA player, Dinara Safina.  They are the first and only brother–sister tandem in tennis history who have both achieved No. 1 rankings.  On court, Safin was famous for his emotional outbursts and sometimes fiery temper.

1999 CA-TennisTrophy – Doubles: Yevgeny Kafelnikov and Daniel Vacek were the defending champions but lost in the first round to Nicolás Lapentti and Marat Safin.

Supporting paragraphs: Victoria Azarenka Marat Safin
Answer: professional tennis player