O'Connell, Duckworth progress in San Diego

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Chris O'Connell has moved into his second career ATP quarterfinal thanks to a 6-3 7-5 upset of eighth seed J.J. Wolf at the San Diego Open ATP 250.

The 130th-ranked O'Connell had seven of his 12 aces in the 43-minute first set and won 80 per cent of his first-serve points.

He will face No.2 seed Jenson Brooksby in the last eight, who progressed courtesy of a 6-4 3-6 6-2 win over fellow Californian Mackenzie McDonald.

O'Connell is joined in the quarterfinals by James Duckworth, who beat Mitchell Krueger in straight sets and will now face another American in No.3 seed Marcos Giron.

Top-seed Daniel Evans of Great Britain beat 95th-ranked Taro Daniel of Japan 6-4 6-4 to reach his fourth tour-level quarterfinal of the year.

The world No. 25, who was coming off an indoor Davis Cup outing in Glasgow, Scotland, is now headed for a first-time meeting with Frenchman Constant Lestienne.

"I was good behind my serve from the end of the first set to the end of the match," Evans said.

"I had good variation and played the game on my terms. That's the biggest thing I was happy with - I played the match on my terms and made him think a lot."

San Diegan Brandon Nakashima, 21, continued to make the most of his home-court advantage by beating Denis Kudla 6-3 6-4 to reach the quarterfinals.

Nakashima earned a head-to-head with Colombia's Daniel Galan, who he defeated in the third round at this year's Wimbledon.