Sam Querrey and Alexandr Dolgopolov will be relieved to have been scheduled in the evening session for their ATP Washington semi-final.
The conditions in Washington have been so brutal this week that there have been calls for the tournament to be moved to a diferent location in the calendar. All the players were pushed to the limit on Friday when temperatures soared to 94 degrees with almost unbearable humidity.
The muggy air makes things tough enough for players in the night sessions and Querrey and Dolgopolov will be relieved that they don't have to contend with the baking daytime heat too when they meet later today.
World number 25 and second seed Dolgopolov is enjoying a very impressive debut in Washington, reaching the last four without dropping a set. He ended James Blake's challenge in Friday's quarters, defeating the 2002 champion 7-6(3), 6-4 in an hour and 22 minutes.
However Querrey is on a winning streak of seven matches which he extended with a 6-4, 6-4 win over third seed Kevin Anderson. Querrey's serving has been unstoppable in the past couple of rounds and against Anderson he only dropped four points when he landed his first serve in court.
Dolgopolov is a far more skilful returner than the South American but he'll still have his work cut out.
Prediction: Querrey in three.