Top stats to know: Williams versus Williams

Serena Williams has a 15-11 career record against her sister Venus Williams. Getty Images

There’s a lot on the line for Serena Williams as she faces her sister Venus Williams in the women’s singles quarterfinals at the US Open on Tuesday.

Serena Williams is trying to keep her hope of a calendar-year Grand Slam alive. The last player to accomplish that feat was Steffi Graf in 1988.

Serena has won 32 straight Grand Slam matches and 25 straight US Open matches. Her last US Open loss was to Samantha Stosur in the 2011 final. Serena has a match record of 52-2 this season.

Serena is 15-11 in her career against Venus, including a win in the round of 16 at Wimbledon this year.

Head-to-head history

The Williams sisters have met 26 times, the most that Serena has faced anyone (next-most is Maria Sharapova, 20 times). The only player whom Venus has played more often is Lindsay Davenport, though this meeting of the sisters will be the 27th, matching the number of times Venus has played Davenport.

Serena has a .577 career win percentage against Venus. Venus, the elder Williams, is one of 19 opponents whom Serena has faced at least 10 times, and the only players against whom Serena has fared worse are Martina Hingis (7-6, .538 win percentage) and Justine Henin (8-6, .571 win percentage).

This will be the Williamses’ 14th meeting at a Grand Slam. Only Martina Navratilova and Chris Evert (22) have had more Grand Slam matches in the Open era (which began in 1968).

Tuesday’s match will be 14 years to the day of their first US Open meeting, in 2001. Each sister has won twice against the other at the US Open.

The last time they met at the Open was also in a quarterfinal, when Serena won, 8-6, 9-7. That was the only other time the Williams sisters met in the quarterfinals at a Grand Slam.

Serena has won six of the last seven meetings.

Fatigue factor

Serena should have an advantage over Venus, in that she’ll be better-rested. Serena has been on the court for four hours, 59 minutes at the Open. Venus has been on court for seven hours, six minutes.

Serena has also fixed something that was an issue in the early rounds. She had no double faults in her round-of-16 win after having 17 in the tournament entering that round.

Serena won 70 percent of the points on her second serve, compared with 36 percent in the second round and 42 percent in the third.

First-set advantage

The winner of the first set when Venus and Serena meet has won 22 of their previous 26 meetings.