World No. 7, Juan Martin Del Potro managed to win two games on the same day, to commence into the last eight of the ATP Citi Open in Washington.
The tournament schedule had been delayed because of rain, however Del Potro had no qualms with playing two games in one day.
The Argentine first beat American Ryan Harrison 6-1 7-5, and then went on to complete a second victory five hours later, beating Australian Bernard Tomic 6-3 6-3. The top seed revealed that the weather conditions were influential in his performances, admitting the sun caused problems for him.
"I feel good," Del Potro said. "I was training hard before I came here. During the night you feel much better. In the first match the sun was harder for me. In the night I move much better."
Del Potro admitted he is content with his current form, especially at such an early stage in the hardcourt season.
"For the first day of the hardcourt season, I had a very good day," Del Potro said. "I beat two young players with good potential. I should play better all the matches."
Del Potro will face No 21 seed Kevin Anderson in the quarter finals of the competition in Washington. Anderson beat Mardy Fish 7-6 (7-2) 6-1 to book his place against Del Potro in the quarter finals.
Del Potro has a superb record against Anderson, winning all four matches against the No 21 seed, with the most recent victory last year at Basel.
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