Which professional tennis player wrote the autobiography "Unstoppable: My Life So Far" describing her life, struggles and Grand Slam victories?

Introduction / Context:
Here the exam tests your awareness of modern sports autobiographies. "Unstoppable: My Life So Far" is a well known autobiography by a leading women tennis champion, and identifying the correct player shows both sports and reading awareness.

Given Data / Assumptions:

• The book title is "Unstoppable: My Life So Far".
• It is an autobiography, so written by the sportsperson herself.
• All four options are famous women tennis players.
• Only one actually wrote this book.

Concept / Approach:
Maria Sharapova, a multiple Grand Slam winner from Russia, released this autobiography to narrate her journey from childhood training to tennis stardom, including injuries and a comeback. While all options are world class players, each has a different autobiography or no major book at all, so you must match the exact title to the correct player.

Step-by-Step Solution:
Step 1: Recall that Maria Sharapova is associated with the book "Unstoppable: My Life So Far". Step 2: Serena Williams has written different books and has a different title for her memoir. Step 3: Sania Mirza and Venus Williams are also accomplished, but they are not linked to this specific title. Step 4: By direct memory or elimination, narrow the answer to Maria Sharapova. Step 5: Confirm that she is widely credited as the author of this autobiography.

Verification / Alternative check:
If you quickly search sports news articles or book reviews, you will repeatedly see that "Unstoppable: My Life So Far" is described as Maria Sharapova life story. Exam guides and general knowledge books on sports literature also list this pairing, which confirms the answer.

Why Other Options Are Wrong:
Serena Williams: A legendary player, but her main memoirs use other titles.
Sania Mirza: Indian tennis star with her own story, not this book.
Venus Williams: Another champion with a different focus and branding, not author of this title.

Common Pitfalls:
Students sometimes guess Serena Williams simply because she is more widely known, ignoring the exact wording of the book title. Always match titles precisely to names rather than relying only on fame.

Final Answer:
Maria Sharapova