© Emily Jaschke
Top seeded American James Blake proved too much for 15-year-old compatriot Ryan Harrison, as he defeated the young qualifier 6-3, 6-2 in second round action on Thursday at the US Men's Clay Court Championship in Houston.

Blake advances to the quarterfinals for the sixth time this season. With the exception of a loss in his season opener in Sydney, he has reached the quarterfinals in each of his main draw appearances.

Harrison had become the third youngest player to win an ATP match since 1990 (behind Richard Gasquet and Rafael Nadal) when he defeated Uruguay's Pablo Cuevas in straight sets on Monday.

"They come into these tournaments, they know what to expect," said Blake, who opened with a win over 18-year-old Kei Nishikori on Wednesday. "It's fun. I'm sure it was a lot of fun for him, I'm sure it was a good experience that he'll learn from. It's a little tough when I go out there because I'm expected to win and he has no pressure. I didn't really have much of a scouting report to go on, so it was interesting. He's got a good future."

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The 28-year-old Blake takes a 2-1 record into his quarterfinal match against Argentine fifth seed Agustin Calleri, including a win in their only clay meeting last year at the ARAG ATP World Team Championship in Duesseldorf.

Calleri, who is making his event debut, brushed aside Paul Capdeville 6-2, 6-1 as he broke the Chilean four times in 15 chances to post the win in just under an hour. He said: "Today I played very well. I stayed focused all the time because Paul is a really good player."

Calleri, 31, will be appearing in his fifth quarterfinal of 2008, but will be looking to reach the semifinals for the first time since last July at Kitzbuehel.

Earlier in the day, American Wayne Odesnik (pictured) advanced to the first career ATP quarterfinal with a 6-3, 7-5 win over sixth seeded Israeli Dudi Sela.

"Being in that situation enough times, I'm starting to get comfortable and I know that I belong here," said Odesnik. "Hopefully this year I'll break through and reach my first career final, or hopefully win my first tournament."

Odesnik made his ATP debut at this event four years ago as a wild card, but did not win his first ATP match until last August in Washington, where he advanced to the third round. Last month, the 22-year-old reached a career-high ranking of No. 116.

He will next face Argentine Sergio Roitman, who advanced with a 6-3, 7-6(3) win over Russian Igor Kunitsyn. The 28-year-old snapped a five-match losing streak with his win over American John Isner in his first round match.

Spaniard Marcel Granollers-Pujol became the only seeded player in the bottom half of the draw to make his way safely into the quarterfinals when he defeated Australia's Peter Luczak, 6-3, 6-2. The No. 7 seed will face Marcos Daniel for a place in the semifinals after the Brazilian dismissed 2000 finalist Nicolas Massu, 7-6(3), 6-2.

Wednesday: Blake Avenges Delray Loss; Fish Through to QF
Tuesday: Fish Opens Bid to Recapture Title; Haas Falls
Monday: Harrison Third Youngest ATP Match Winner Since 1990
Qualifying: Fifteen-Year-Old Harrison Earns Main Draw Berth