Moore said he was able to keep his composure because he had been in similar situations many times.
"I've been pitching my whole life," Moore said.
Moore, who completed the no-hitter by striking out Carlos Hernandez, came within one whiff of a career high of 14 strikeouts.
"After I got my rhythm down, I started throwing the way I was supposed to," Moore said.
He added he was able to relax as the game progressed.
Of Singh, Moore said: "He's a smart pitcher."
He added he had a tough time facing Singh in his at-bats.
"He just threw good," Moore said. "It's just that our hitters came through."
Imperial coach Alfred Moore said he was proud of Brock, along with the rest of his defense.
"I'm proud of (Brock)," Alfred Moore said. "But he couldn't have done it without his defense."
Alfred Moore gave Sunbeam's pitching credit and said he was impressed by Singh's performance.
"Sunbeam pitched us very well," Alfred Moore said. "Singh did a good job. I give all the credit to him.
"I didn't know what to expect out of Sunbeam," Alfred Moore added. "But they gave us a heck of a game.
"We were in shell shock because last night there was so much hitting and tonight there was so much pitching."
Alfred Moore said he was a bit nervous throughout the game, but his confidence grew with every out his defense forced.
"I felt pretty confident going into the last inning," Alfred Moore said.
"Sunbeam's a heck of a team," Alfred Moore said. "I wouldn't be surprised to see them again."
Imperial will next face Holtville and Alfred Moore said he is excited about the match-up because of the storied rivalry between the two cities.
"It's nice to have two small towns in the semifinal game," Alfred Moore said.
Brock Moore said he is looking forward to the next game, but to win he said his team needs to "keep our heads straight and never give up."
"We've had some pretty strong competition so far," Brock Moore said.
Imperial will face Holtville at 7:30 tonight, while Sunbeam will face Calexico at 5:30 tonight. Both games will be played in Seeley.
In other District 22 11-12-year-old action, Calexico topped Seaview 13-0 in four innings and Holtville defeated Brawley 6-5.
Brawley will take on El Centro at 7:30 tonight in Seeley.