Janko Tipsarevic gained a measure of revenge for his loss to Sam Querrey last week by shocking the hard-serving American 7-6 6-3 under sweltering conditions on Wednesday at the Washington Classic.
The unseeded Serb lost only six points on his serve during the second-round match against Querrey despite successfully landing only 56 percent of his first serves.
Tipsarevic squandered a second-set match point to Querrey in the semi-finals of the Los Angeles Open last week. The American ultimately went on to claim his fourth title of 2010.
"I was focused from start to finish," Tipsarevic told reporters after his match.
In other matches , Ukrainian Illya Marchenko was leading Ernests Gulbis 6-1 1-0 when the ninth-seeded Latvian wilted in the steamy conditions and retired.
Australia’s Lleyton Hewitt, who won the tournament in 2004, also retired suffering an injury to his right calf during his match against Colombian Alejandro Falla.
Kleybanova stuns tentative Jankovic
Russia’s Alisa Kleybanova overcame a sluggish start to upset top seeded Serb Jelena Jankovic 7-5 6-2 in the second round of the San Diego Classic on Wednesday.
The powerful Kleybanova fell into a 0-4 hole in the first set before recovering. Jankovic injured her left ankle in Slovenia two weeks ago and admitted that she was not fully fit.
Two other seeds also advanced as number four Agnieszka Radwanska of Poland thrashed former world number one Dinara Safina 6-1 6-3 and seventh seed Shahar Peer of Israel overcame Yaroslava Shvedova of Kazakhstan 7-5 6-4.
Bryans eye Grand Slam doubles record
US twin brothers Bob and Mike Bryan already have their next goal in mind after setting an ATP record with their 62nd doubles crown — capturing a record 12 Grand Slam men’s doubles crowns.
The American siblings won their Washington Classic opener on Wednesday after breaking the all-time doubles title mark they had shared with Australians Todd Woodbridge and Mark Woodforde by winning last Sunday’s Los Angeles final.