Rezső Velez started to compete in sport shooting in 1908, and won his first national title in 1911. In 1912, he won the national qualifying competition for the Olympics, where he competed in four events, with a best result of seventh. He qualified for the Olympics again in 1924 where he competed in seven events, finishing sixth in the team running target, single shot event.
During his sporting career, Velez was secretary-general of the National Shooting Federation. He resigned from office in 1925. As a mechanical engineer he graduated from the Budapest Technical University and was the head of Phillips’s Hungarian company from the 1920s. He was also appointed as a government consultant in 1928.
|Games||Discipline (Sport) / Event||NOC / Team||Pos||Medal||As|
|1912 Summer Olympics||Shooting||HUN||Rezső Velez|
|Free Rifle, Three Positions, 300 metres, Men (Olympic)||72|
|Military Rifle, Three Positions, 300 metres, Men (Olympic)||7|
|Military Rifle, Any Position, 600 metres, Men (Olympic)||73|
|Military Rifle, 200, 400, 500 and 600 metres, Team, Men (Olympic)||Hungary||10|
|1924 Summer Olympics||Shooting||HUN||Rezső Velez|
|Rapid-Fire Pistol, 25 metres, Men (Olympic)||31|
|Free Rifle, Prone, 600 metres, Men (Olympic)||=35|
|Free Rifle, 400, 600 and 800 metres, Team, Men (Olympic)||Hungary|
|Small-Bore Rifle, Prone, 50 metres, Men (Olympic)||=47|
|Running Target, Single Shot, Men (Olympic)||=10|
|Running Target, Single Shot, Team, Men (Olympic)||Hungary||6|
|Running Target, Double Shot, Men (Olympic)|