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Harrison won six of the final eight games and had some help from technology inside the Silicon Valley arena that’s home to the NHL’s San Jose Sharks.

Kutrovsky served an ace at 4-all, 30-all, and Harrison challenged. The shot was overruled out, Harrison won a long rally and then challenged a passing shot by Kutrovsky on the following point that the line judge missed. The replay revealed the ball sailed wide left, Harrison earned the break and cruised to victory on his service game.

Harrison already had caught a major break this week.

Top-seed Gael Monfils of France withdrew from his second-round match because of inflammation in his right knee. Kutrovsky defeated his replacement, Blake Strode, and now Harrison is just two matches away from his first tour title after topping Kutrovsky in straight sets.

The semifinals will also be a rematch from a more famous California tournament. Harrison beat Ranoic 7-6 (1), 4-6, 6-4 in the third round at Indian Wells last year.

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Follow Antonio Gonzalez at: www.twitter.com/agonzalezAP