Time is on her side. Stephens is the youngest player in the top 20 and has reached the round of 16 at every Grand Slam event this year, one of only three players to do that in 2013 along with Williams and Agnieszka Radwanska. She does not have many points to defend and will likely end in the top 10 by the year's end. (She will leave the Open ranked in the top 15 and no higher than No. 12.) Stephens told reporters late on Sunday that she would watch this match again after the conclusion of the year. What she will find is a young player not too far away from challenging Williams. Her time is surely coming, but Serena's time is now.