#5
Steffi Graf
Steffi Graf's 1988 Golden Slam — winning all four Grand Slams and Olympic gold in a single calendar year — remains the most dominant single-season achievement in tennis history. Her 1988 season alone saw a 72–3 win-loss record and 11 titles, a feat so extraordinary it may never be replicated, exceeding any rival's peak year by at least two majors.
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