On July 1, 2003, Muramatsu recorded a hit for the cycle. Atsunori Inaba of the Yakult Swallows also recorded a hit for the cycle on the same day, the first time in NPB history.[3] He also finished fifth all-time in NPB records with 13 triples.[2] And he had won the Japanese Golden Glove award in outfield from 2003 to 2004.
Starting in the 2004 season he exercised his free agent rights and joined the Orix Buffaloes, where he played for five seasons until the 2008 season.[2]
In the 2009 season, Muramatsu returned to the Hawks in a trade for Naoyuki Ohmura, played two seasons, and retired after the 2010 season.[2]
After his retirement, Muramatsu became the scout in charge of the Tokai region for the Fukuoka Softbank Hawks.[4]
He had been the third squad outfield defense and base coach since the 2014 season and the first squad outfield defense and base coach since the 2017 season.[5][6]
He was transferred to the first squad hitting coach since the 2024 season.[1]
On February 6, 2015, he was appointed as Japan national baseball team's outfield defense and base running coach for the GLOBAL BASEBALL MATCH 2015 Samurai Japan vs. Europe.[7]