Strong attended Fredrick Douglass High School in Baltimore, Maryland. Playing the point guard position, he averaged 22 points, four assists and three steals per game as a senior in 2007–08. That year Frederick Douglass won the Baltimore city title. Strong was named to The Baltimore Sun All-Metro team in each of his final two seasons.
Collegiate career
Junior college
Due to poor academic performance, Strong was unable to commit to a four-year college basketball program right out of high school. He enrolled at Cecil College, a junior college in Maryland, to work on his academics while also gain some playing experience at the next level. He played for Cecil in 2008–09, took one season off to focus solely on school, then re-joined the team in 2010–11. Numerous mid-major universities offered him scholarships after his second season at Cecil. Strong ultimately chose to play for the Texas Southern Tigers, citing "I think I'll have a better experience if I go away."
In February 2014 Strong signed a contract with Bulgarian club Beroe. He scored a season-high 24 points in a game against Spartak Pleven. He appeared in 9 games throughout the season, averaging 14.7 points, 1.6 rebounds and 1.8 assists per game. He joined Mississauga Power of NBL Canada for the 2014–15 season. On January 11, 2015 Strong scored a career-high 44 points against the Island Storm, also setting the franchise record in scoring. In the same match Strong set a league-high for NBL Canada in three point shots making 11. In 29 regular season games, Strong averaged 18.7 points, 2.8 rebounds and 2.6 assists per game on 32.7 minutes per game. On April 13, 2015, Strong was named Sixth Man of the Year of the NBL Canada. According to him, Mississauga Power head coach Kyle Julius "really saw something in him". He was named in the All-NBL Canada Second-team for the 2014–15 season. By the end of the 2014–15 season, he became the Power's all-time leader in three-pointers, with 148, passing Nick Okorie, who had 141. On July 1, 2015, Strong signed with UJAP Quimper 29 of the Nationale Masculine 1 in France. Strong competes for Team City of Gods in The Basketball Tournament. He was a point guard on the 2015 team who made it to the semifinals, losing to Overseas Elite 84-71. On February 6, 2018, Strong signed with the Windsor Express of the National Basketball League of Canada.
Personal
Strong is the father of Omar Strong Jr., for whom he planned to return to Baltimore while in college. He said, "It's just like I know what I came up from. I want him to have everything I didn't and much more. If I'm through something, I just think about my son and get through it." Strong often uses his son for motivation and inspiration.