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Irvin Koszewski (Zabo) is a Men's Open Bodybuilding competitor from the United States. Irvin Koszewski (Zabo) has a verified height of 5'10" (178 cm) and a recorded contest weight of 186 lb (84 kg).
6 career wins
Irvin Koszewski (Zabo)
Irvin Koszewski (Zabo), a bodybuilder from the United States, stands 5'10" (178 cm) tall and competed at a contest weight of around 186 lb (84 kg). He was born on August 20, 1924.
Career Record
- Total Results
- 28
- Wins
- 6
- Win Rate
- 21.4%
- Career
- 1950–1967
- Height
- 5'10" (178 cm)
- Weight
- 186 lb (84 kg)
- Division
- Men's Open Bodybuilding
- Country
- United States
- Verified
- Sources
- 2
Irvin Koszewski, known throughout his competitive life as Zabo, was one of the figures of the Muscle Beach era. Born in 1924, he competed from 1950 to 1967 and has twenty-eight results on record, all of them amateur.
Win rate here is first-place finishes as a share of all 28 recorded contest results. It is published only where a career holds at least five, because below that a single placing moves the figure by twenty points or more.
Every season on record
Peak Year 1950 (2 wins)
Measured against Irvin Koszewski (Zabo)’s own seasons, not against the field.
Olympia
1st place
2nd place
3rd place
Other
- Pro Debut
- 1950
- Last Contest
- 1967
Known for
The California titles. He won Mr Middle Atlantic in 1950, then Mr Pacific Coast and Mr Los Angeles in 1953 and Mr California in 1954. He also took two Most Muscular awards in 1954, which is the award that fits what he was known for.
Early career
His first recorded contest was in 1950, in the junior class, and he was winning open titles inside the same year. He was runner-up at Mr Strength and Health in 1951 and at Mr Southern California in 1953. He was still competing in 1967, in the medium class, seventeen years after the record opens. He stood 178 cm and competed at 84 kg.
Physique benchmark
How Irvin Koszewski (Zabo) measures up
Fat-free mass index turns the height and weight on this profile into one number for how much muscle a frame carries, so a shorter competitor is not flattered by a bodyweight comparison. The normalised figure adjusts it again to a standard height, which is the version worth ranking. Both assume the 6% body fat a competitor steps on stage at, because that is the only condition the recorded weight was taken in.
25.0FFMI
25.2Normalised FFMI
275thOf 316 measured men
The closest Olympia champion on that measure is Ryan Terry, at 25.9.
What this rank is not. This database holds a height and a weight for just 463 athletes, and they are overwhelmingly the ones somebody bothered to measure: 73 of them hold an Olympia title. Almost every competitor on record carries no measurement at all. The pool also mixes every division and era together, from the lightweight women's classes to the open heavyweights, so it ranks size and nothing else. It says where Irvin Koszewski (Zabo) sits among the athletes we hold measurements for, not among competitors.
All results
Every contest result on record for Irvin Koszewski (Zabo), 28 in all. The table opens on the first 15 and expands in place from there. Nothing sits on a separate page. Won by names the winner of the division Irvin Koszewski (Zabo) competed in, and shows a dash where that winner cannot be pinned to one person in the database.
| Year | Contest | Division | Place | Won by |
|---|---|---|---|---|
| 1967 | Mr America | Other Divisions | #2 | Frank Zane |
| 1967 | Mr Los Angeles - Pro | Men's Open Bodybuilding | #2 | Gable Boudreaux |
| 1965 | Mr America | Other Divisions | #3 | Nick Perrotti |
| 1957 | Mr USA | Men's Open Bodybuilding | #5 | Dick DuBois |
| 1956 | Mr USA | Men's Open Bodybuilding | #3 | Bill Pearl |
| 1954 | Junior Mr America | Other Divisions | #2 | Gene Bohaty |
| 1954 | Mr America | Other Divisions | #2 | George Paine |
| 1954 | Mr America | Men's Open Bodybuilding | #3 | Dick DuBois |
| 1954 | Mr California | Other Divisions | #1 | Winner |
| 1954 | Mr California | Men's Open Bodybuilding | #1 | Winner |
| 1953 | Mr America | Men's Open Bodybuilding | #3 | Bill Pearl |
| 1953 | Mr California | Men's Open Bodybuilding | #2 | Bill Pearl |
| 1953 | Mr Los Angeles | Men's Open Bodybuilding | #1 | Winner |
| 1953 | Mr Pacific Coast | Men's Open Bodybuilding | #1 | Winner |
| 1953 | Mr Southern California | Men's Open Bodybuilding | #2 | Bill Pearl |
| 1952 | Junior Mr America | Men's Open Bodybuilding | #3 | Malcolm Brenner |
| 1952 | Mr America | Men's Open Bodybuilding | #5 | Jim Park |
| 1952 | Mr California | Men's Open Bodybuilding | #4 | Bob Shealey |
| 1952 | Mr Eastern America | Men's Open Bodybuilding | #3 | George Paine |
| 1952 | Mr Southern California | Men's Open Bodybuilding | #3 | Bob Shealey |
| 1951 | Junior Mr America | Men's Open Bodybuilding | #4 | George Paine |
| 1951 | Mr Eastern America | Men's Open Bodybuilding | #3 | George Paine |
| 1951 | Mr Strength and Health | Men's Open Bodybuilding | #2 | Melvin Wells |
| 1950 | Junior Mr America | Men's Open Bodybuilding | Unplaced | John Farbotnik |
| 1950 | Mr America | Men's Open Bodybuilding | #13 | John Farbotnik |
| 1950 | Mr Eastern America | Men's Open Bodybuilding | #3 | Marvin Eder |
| 1950 | Mr Middle Atlantic | Other Divisions | #1 | Winner |
| 1950 | Mr Middle Atlantic | Men's Open Bodybuilding | #1 | Winner |
Showing 15 of 28 recorded results.
Where these results come from. Each contest in the table was recorded from a named source, and for Irvin Koszewski (Zabo) that source is MuscleMemory. Open any contest above and that page names its own source and links to it where the source is still reachable. That archive no longer answers at the addresses we hold, so it is credited by name here and not offered as a link.
More Men's Open Bodybuilding athletes Athletes from United States
Sources
Contest record and measurements from the Fitness Volt bodybuilding database. The database holds no death date for him and this page does not infer one, so nothing here should be read as a statement either way about a man born in 1924.
Most-met rivals
Compare any two athletes →In 6 meetings, George Paine finished ahead of Irvin Koszewski (Zabo) 4 times to 2.
Opponents are ranked by how often they shared a stage and how big the stage was, not by reputation. A meeting is one contest where both competed in the same division and both were placed.
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