HOUSTON (AP) — Top-seeded James Blake beat Japan's Kei Nishikori 6-4, 6-4 Wednesday night to advance to the second round in the U.S. Men's Clay Court Championship.

Blake's win avenged a three-set loss two months ago to Nishikori in the final of a hard-court tournament in Florida.

"It definitely feels good any time you can avenge a loss," Blake said. "He's an excellent player, and 18 years old, he's got a huge learning curve and will continue to get better."

Next up for Blake is Texan Ryan Harrison, who on Monday became only the 11th player in the Open Era to win a main-draw match at 15. The two Americans play Thursday night.