Premise: Serena Williams . Her total of 23 Grand Slam singles titles marks the record for the most Grand Slam wins by a tennis player in the Open Era , and is second on the all-time list behind Margaret Court ( 24 ) . She has won an all-time record of 13 Grand Slam singles titles on hardcourt .
Hypothesis: Serena Williams is a Grand Slam winner.
Label: ENTAILMENT