That same season, he became the 1st player in school history to lead his team in 5 major statistical categories (Scoring, Assists, Rebounds, Steals, 3-pointers made).

Grundy played with the National Basketball Association's Atlanta Hawks in 12 games after signing a ten-day contract in the 2005–06 NBA season.

Grundy's final NBA game was played on April 19, 2006, in a 99 - 100 loss to the Cleveland Cavaliers where he recorded 2 points, 2 assists and 1 rebound.

[5] On July 15, 2011, he was signed by the Petron Blaze Boosters as a replacement import for the injured Jeremy Wise.

[6] He was able to lead the Boosters win the 2011 PBA Governors Cup over the Talk 'N Text Tropang Texters.

He was sentenced in October 2017, to two years in prison for a felony charge of DWI, five misdemeanor counts of failing to appear in court and two probation violations.