Sania Mirza won a Grand Slam mixed doubles title with Mahesh Bhupathi in 2009 at which major tennis tournament?

Introduction / Context:
This question focuses on Indian achievements in Grand Slam tennis, specifically in the mixed doubles category. Sania Mirza and Mahesh Bhupathi formed a successful mixed doubles pair, and one of their notable titles came in 2009. Remembering at which Grand Slam this victory occurred is an important detail for sports general knowledge and national sports pride.

Given Data / Assumptions:
• The pair mentioned is Sania Mirza and Mahesh Bhupathi, both Indian tennis players.
• The year of the title is 2009.
• The question asks for the major tennis tournament where they won a mixed doubles Grand Slam title.
• The options include two Grand Slams (US Open, Australian Open, French Open) and two other tournaments which are not Grand Slams.

Concept / Approach:
Sania Mirza and Mahesh Bhupathi won the mixed doubles title at the Australian Open in 2009. While Bhupathi has Grand Slam titles from other years and tournaments as well, this particular joint success with Sania in 2009 is associated with the Australian Open. Therefore, Australian Open 2009 is the correct option, not the US Open or French Open that year, and certainly not the non Grand Slam events listed.

Step-by-Step Solution:
Step 1: Note that the question refers to a Grand Slam mixed doubles title in 2009 involving Sania Mirza and Mahesh Bhupathi.Step 2: Recall that their landmark mixed doubles victory together came at the Australian Open in early 2009.Step 3: Look at the options and identify Australian Open 2009 as the correct Grand Slam and year combination.Step 4: Eliminate US Open 2009 and French Open 2009, as well as the smaller tournaments, because they do not match the known title.

Verification / Alternative check:

Why Other Options Are Wrong:
• US Open 2009 did not feature a mixed doubles Grand Slam win by this pair, so this option is incorrect.
• South Africa Tennis Open 2009 is not a Grand Slam event and does not match the description in the question.
• ATP Challenger Tennis Championship 2009 refers to a lower level tour event, not a Grand Slam mixed doubles title.
• French Open 2009 was not the tournament where Sania and Bhupathi claimed a mixed doubles title together in that year.

Common Pitfalls:
Many candidates mix up different Grand Slam events and may guess US Open or French Open because they are also big tournaments. Others pay attention only to the year and ignore the requirement that it must be a Grand Slam title with that specific pair. To avoid this, it helps to memorise a simple mapping of Indian tennis achievements, such as Australian Open 2009 for Sania Mirza and Mahesh Bhupathi in mixed doubles.

Final Answer:
The correct answer is Australian Open 2009, where Sania Mirza and Mahesh Bhupathi won the Grand Slam mixed doubles title together.