In his first-round match, Rosenfeld was down 3-down to Joshua Wooding, 16, of Riverside, Calif., after the first 13 holes, but came back to win the last five holes of the match to earn a 2-up victory.
In the afternoons second-round match against Matt McLean, 17, of Weston, Fla., Rosenfeld was 2-down twice but evened the match at the 15th hole. He captured the match at the par-3, 195-yard 18th hole when McLean missed a one-foot putt that would have forced extra holes.
Rosenfeld will meet Kevin Silva, who played just 24 holes of golf in his two matches Wednesday. Silva earned an 8-and-6 first-round win over Steven Bain, 15, of Nassau, Bahamas, and a 7-and-6 victory over Andrew Gallo, 17, of Ontario, Canada.
Zack Amole, 17, of Denver, Pa., scored the biggest upset of the morning with his 1-up victory in the first round over medalist James Vargas, 17, of Miami, Fla.
Amole was eliminated by Brendon Todd, 15, of Cary, N.C. in the second round. Also eliminated Wednesday were the rest of the top-five finishers from stroke play: Scotty Campbell, 16, Conway, Ark., Jonathan Moore, 16, Portland, Ore., Eddie Lee, Christchurch, 17, New Zealand, and Colin Biles, 16, Upper Arlington, Ohio.
The third round and quarterfinals will be held Friday. The semifinals and the championship final are scheduled for Saturday.
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