Asunto, 14, sang the Philippine national anthem "Lupang Hinirang" while Sanchez, 16, sang the American national anthem "Star-Spangled Banner" on Saturday night (Sunday morning in Manila) at the MGM Grand in Las Vegas in the United States.
The audience clapped wildly as Asunto was about to finish singing the Philippine anthem perfectly, without missing a note.
In contrast, the audience cheered the more popular Sanchez even as she was just starting to sing the American anthem.
The audience of 16,000 included Filipino-American singer Apl.de.Ap, Hollywood celebrities Mark Wahlberg and Jeremy Renner, who recently shot the movie "Bourne Legacy" in the Philippines.
Asunto, who recently signed a contract under Pacquiao's talent management agency, wore a red dress by Filipino Hollywood designer Oliver Tolentino.
On Twitter, Tolentino said: “Good Saturday AM! Looking forward to Kirby Asunto singing the Philippine national anthem tonight in my red dress at the Pacquiao fight.”
Sanchez, on the other hand, wore a tight-fitting yellow dress with black designs.
A day before, Sanchez posted on Twitter a photo of a Pacquiao-Bradley promotional streamer and said: "I'm here."
Meanwhile, Filipino boxer Ernie “The Rock” Sanchez, who fought in undercard bout to the main event and is also under Pacquiao’s wing won via unanimous decision against Dominican Wilton Hilario with his sudden spurts of explosive combinations reminiscent of the young Pacquiao.
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