Premise: Serena Williams . On the sixth occasion , she held the ranking for 186 consecutive weeks , tying the record set by Steffi Graf for the most consecutive weeks as world no. 1 by a female tennis player . She is the most recent female player to have held all four Grand Slam singles titles simultaneously ( 2002 -- 03 and 2014 -- 15 ) and the third player to achieve this record twice after Rod Laver and Steffi Graf .
Hypothesis: Serena Williams is the sole holder of a record.
Label: NEUTRAL