Question: John Austin and Mahesh Bhupathi, share which mutual former occupation?

Context paragraphs:
John Austin (tennis): John Austin (born July 31, 1957) is an American former professional tennis player born in Long Beach, California.  He won the Wimbledon mixed doubles championship with his sister, Tracy Austin, in 1980, becoming the first brother and sister team to win a Grand Slam title together.

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.

Mahesh Bhupathi Tennis Academy: Mahesh Bhupathi Tennis Academy is a tennis training facility started by Indian tennis player Mahesh Bhupathi.  The Academy has facilities across 9 states in India as well as in the UAE.

Mahesh Bhupathi: Mahesh Shrinivas Bhupathi (born 7 June 1974) is a retired Indian professional tennis player.  In 1997, he became the first Indian to win a Grand Slam tournament (with Rika Hiraki).  With his win at the Australian Open mixed doubles in 2006, he joined the elite group of eight tennis players who have achieved a career Grand Slam in mixed doubles.  He is also the founder of International Premier Tennis League.  In December 2016, Bhupathi was appointed as India's next non-playing Davis Cup captain and took over the reins from Anand Amritraj in February 2017.

2010 Rogers Cup – Men's Doubles: Mahesh Bhupathi and Mark Knowles were the defending champions, but they chose to not compete together this year.  Bhupathi played with Max Mirnyi and Knowles partnered with Radek Štěpánek.

2004 Canada Masters – Doubles: The 2004 Canada Masters – Doubles was the men's singles event of the one hundred and fifteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada.  Mahesh Bhupathi and Max Mirnyi were the defending champions.  They were both present but did not compete together.  Mirnyi partnered with Jonas Björkman, but Bhupathi and partner Leander Paes defeated them 6–4, 6–2, in the final.

2004 Kremlin Cup – Men's Doubles: Mahesh Bhupathi and Max Mirnyi were the defending champions, but did not play together this year.  Bhupathi partnered Jonas Björkman, losing in the final.  Mirnyi partnered Marat Safin, withdrawing from the quarterfinals.

2000 Wimbledon Championships – Men's Doubles: Mahesh Bhupathi and Leander Paes were the defending champions, but did not play together in the doubles.  Bhupathi partnered with David Prinosil and lost in the third round.

2007 China Open – Men's Doubles: Mahesh Bhupathi and Mario Ančić were the defending champions, but Ančić chose not to participate, and only Bhupathi competed that year.

2012 Western &amp; Southern Open – Men's Doubles: Mahesh Bhupathi and Leander Paes were the defending champions.  However, they chose not to play together.  Bhupathi played with Rohan Bopanna and Paes played with Radek Štěpánek

Supporting paragraphs: John Austin (tennis) Mahesh Bhupathi
Answer: professional tennis player