Tennis majors – definition of a calendar Grand Slam In tennis, achieving a 'Grand Slam' means winning which specific set of four major tournaments within the same calendar year?

Introduction / Context:
In professional tennis, the term 'Grand Slam' has a precise meaning that often appears in sports quizzes. Understanding which tournaments constitute the Slam—and that it refers to winning all four in one calendar year—avoids common misunderstandings.

Given Data / Assumptions:

• Grand Slam here means the calendar-year Grand Slam, not just career wins.
• The four majors are globally recognized and fixed.
• Surface types vary, increasing the challenge.

Concept / Approach:
The four majors are the Australian Open, Roland Garros (French Open), Wimbledon, and the US Open. Winning all four in a single year is the rare 'calendar Grand Slam'; winning them over a career is the 'career Grand Slam'—a different concept.

Step-by-Step Solution:

Verification / Alternative check:
Grand Slam definitions in tennis governing bodies and historical records corroborate that the Slam equals all four majors in a single year.

Why Other Options Are Wrong:

• Three- or two-tournament combinations do not meet the definition of a Grand Slam.

Common Pitfalls:
Confusing a 'calendar Grand Slam' with a 'career Grand Slam' or a 'non-calendar Slam'. The question asks for the classic definition.

Final Answer:
Australian open, French open, U.S. open and Wimbledon