Top seed Juan Martin del Potro of Argentina beat Australian 14th seed Bernard Tomic 6-3 6-3 on Thursday to reach the quarter-finals of the ATP and WTA Washington Open.
The Argentine, showing no signs of a knee injury that nagged him at Wimbledon, will face Kevin Anderson in the last eight after the South African eliminated Australian James Duckworth 6-3 3-6 6-4 to complete a rain-halted match and then beat American Mardy Fish 7-6 (7-2) 6-1.
Earlier on Thursday, Australian Marinko Matosevic recorded arguably the biggest win of his career, upsetting Canadian fourth seed Milos Raonic in straight sets.
Matosevic triumphed 7-5 7-6 (9-7) to set up a quarter-final showdown with Russian Dmitry Tursunov who beat Czech Radek Stepanek 4-6 6-4 7-5.
Rain on Wednesday postponed the opening matches for del Potro and Japanese second seed Kei Nishikori, who had first-round byes, and halted two other men’s encounters at the $US1.76 million ($A1.98 million) hardcourt event.
Nishikori, in Thursday’s other upset, was thrashed 6-1 6-2 by 16th seed Marcos Baghdatis of Cyprus.
In other third-round results, American eighth seed John Isner beat India’s Somdev Devvarman 7-5 7-5, No.11 Grigor Dimitrov of Bulgaria downed sixth-seeded Sam Querrey of the US 6-3 6-2, and German third seed Tommy Haas defeated local player Tim Smyczek 3-6 7-5 6-3.
On the women’s side, the only match halted on Wednesday was Russian Olga Puchkova’s.
She trailed Argentina’s Paula Ormaechea 3-6 6-3, 2-1 when play resumed but surrendered a break and trailed 4-1 in the final set.
Upset at herself after a point, Puchkova struck a ball in frustration and it slammed into the knee of a line judge, injuring the man and prompting the umpire to award the match to her South American opponent.
“It’s not my favourite way to win a match,” Ormaechea said in a Twitter posting.
Puchkova, who had not deliberately fired the ball at the official, walked over to see the line judge as he lay on the court after being struck and apologised to him.
Top-seeded Angelique Kerber of Germany beat Melanie Oudin of the US 7-5 6-0, joined in the third round by No.3 seed Ekaterina Makarova of Russia, No.4 Alize Cornet of France, fifth-seeded Romanian Sorana Cirstea, Slovakian seventh seed Magdalena Rybarikova and Monica Niculescu of Romania.
