In 2010, Phub won a bantamweight silver medal at the South Asian Games in Dhaka, defeating Sri Lankan representative Kamal Sameera in the semi-finals before losing to Naimatullah of Pakistan in the finals. Later that year he reached the quarterfinals at the Asian Games in Guangzhou despite nursing a hand injury, becoming one of the "main sensations" of the event after his two surprise wins. For his performances, he was nominated for Bhutanese sportsperson of the year by Tshering Tobgay. He also won a bronze medal at the 2011 President's Cup in Indonesia, notably beating future Olympic medallist Satoshi Shimizu in the round of 16. Phub competed in the bantamweight event of the 2013 World Championships in Almaty. In his first bout, he defeated Belarusian opponent Dzmitry Sapon on a 3–0 decision. However, despite being "extremely focused and always operating from a high guard," Phub was defeated in his second match by Veaceslav Gojan. His final major tournament was the 2014 Asian Games in Incheon, where he was upset in his first bout by Nadir Baloch of Pakistan.