Dabul, from Argentina, broke serve in the third game of the opening set and held serve for the entire match. Brown, the top-ranked player from Jamaica, upset top-seeded Sam Querrey Wednesday for his first win over a Top 20 opponent.

Dabul will face No. 4 seed Olivier Rochus of Belgium tomorrow. Rochus defeated Raven Klaasen of South Africa, 6-1, 6-3, in 59 minutes.

Rochus will be playing in the semifinals at the Hall of Fame for the second straight year.

“I like to play on grass. It’s not that easy, but I’m playing good,’’ he said. “Two semifinals in a row. I like it. I wish there were more tournaments on grass for me.’’

In the first match, Brown flipped his racket numerous times, yelled at himself and a line judge as he continually hit shots long or into the net. He even walked toward his chair as Dabul served at 40-love in the final game of the first set.

“I saw he was walking away,’’ Dabul said. “I was saying [to myself], I’m going to serve to the T.’’

Brown said he was trying to get off to a good start in the second set.

“It was 40-love. I might as well finish the first set and concentrate on the second,’’ Brown said. “It just didn’t go any better.’’