Glenn Martinez attended Saginaw Valley State University from 2000 to 2003. In 2002, as a junior, he was named as an Honorable Mention All-Great Lakes Intercollegiate Athletic Conference and led the team in receiving yards with 814 receiving yards. In 2003, Martinez was named as a first-team All-Great Lakes Intercollegiate Athletic Conference selection.
Professional career
Pittsburgh Steelers
Martinez originally entered the NFL as an undrafted free agent, signing with the Pittsburgh Steelers in April, 2004. He was released at the end of the preseason during the final roster cut-downs that season.
Detroit Lions
He returned to the NFL for the 2005 season signing a free agent contract with the Detroit Lions, who then allocated him to NFL Europe where he was selected by the Rhein Fire in the 19th round of the 2005 NFL Allocated Player Draft. Martinez completed a successful campaign in Europe, finishing with 4 touchdowns, 384 yards on 29 receptions, and finishing third in the league in punt return yardage. He returned to the Lions for their 2005 training camp and was signed to the practice squad after the preseason. He was later signed to the active squad for week 6 versus the Carolina Panthers. Martinez had his first NFL reception in week 8, an 11-yard reception against the Chicago Bears. After playing in the Lions' week 9 game against the Minnesota Vikings he was again relegated to the practice squad. He would be activated once more for the week 15 game versus the Cincinnati Bengals in which he returned 2 punts and appeared on special teams. In January 2006, Martinez was again signed by Detroit, but was cut prior to the 2006 NFL season. Martinez was later added to the Practice Squad for the remainder of the 2006 NFL season.
Denver Broncos
In January 2007, Martinez was signed by the Denver Broncos to a futures contract. He saw action during the 2007 preseason, but was released on 1 September when teams were making mandatory cuts to finalize their opening day roster. Martinez was added to the Denver Broncos Practice Squad. Due to injuries was added to active roster on 29 September 2007 and saw action in week 4 against the Indianapolis Colts, but did not record any stats. In week 5 against the San Diego Chargers he posted a career highs with six catches for 70 yards while adding an 18-yard punt return. Martinez was waived from the Broncos on November 11, 2008 to make room for running backTatum Bell.
