It’s Semifinal Saturday at the Citi Open! The heat has dissipated, but it’s been replaced by significant wind, which could have a significant effect on today’s tennis. Here are some fast facts on the singles semis.
 Jack Sock vs.  Kevin Anderson
- Sock is playing in his fifth semifinal of the year.
- If he wins the tournament, he’ll be first American to capture the title since Andy Roddick in 2007.
- Sock has only been broken once this week.
- Anderson has struck 50 aces this week, more than double compared to the rest of the field.
- Anderson, a former world No. 10, dropped as low as 80 in the rankings this year as he worked to return from knee, ankle and shoulder issues.
- The players have split their past two meetings on hard court.
 Oceane Dodin vs.  Ekaterina Makarova
- Dodin is just 20 years old and six feet tall.
- The Frenchwoman reached her career-high rank of No. 46 earlier this year, and upset world No. 5 Dominika Cibulkova in Madrid.
- Makarova is a two-time singles Grand Slam semifinalist and a two-time Grand Slam doubles champion with partner Elena Vesnina.
- She’s been ranked as high as No. 8 in the world in singles and No. 3 in the world in doubles.
- This is the first meeting between these two players.
 Nishikori vs.  Alexander Zverev
- Nishikori, a champion here in 2015, is on a 29-event winless streak, having not won a title since Memphis in 2013.
- The world No. 9 saved three match points and earned the 25th win of his season against Tommy Paul on Friday night.
- A win in D.C. would be Zverev’s fourth title of the year.
- Zverev tallied the 100th win of his career this week against Tennys Sandgren in the third round.
- It’s the first meeting between these two players.
 Julia Goerges vs. Andrea Petkovic
- This is an all-German semifinal, with Petkovic winning their last two meetings.
- Petkovic, a 29-year-old former top-10 player, is currently ranked outside the top 100. This is her first semifinal of 2017.
- Petkovic reached the semifinals at Roland Garros in 2014 and is also a two-time major quarterfinalist.
- Goerges has reached the fourth round twice in Grand Slam. She’s also an accomplished doubles player, twice reaching Grand Slam semifinals.
- Goerges, 28, has reached two finals in 2016, including one in Bucharest in July