Career
At a height of 2.17 m (7 ft 15 in), he played at the center position. Trontzos played college basketball in the United States at Gonzaga University, with the Gonzaga Bulldogs. He was the first 7 footer in the school"s history.
Trontzos started playing basketball with Young Men’s Christian Association Thessaloniki.
He then moved to the Greek club AEK Athens. He also helped lead the team to the final four of the International Basketball Federation European Champions Cup of the 1965-1966 season, which was the first time that the Euroleague ever used a final four system, thus helping to lead a Greek team to a final four in the Euroleague for the first time ever.
He scored 24 points in the tournament"s final game. He also played in the Greek Cup Final with AEK twice, in the years 1976 and 1978.
Trontzos also coached AEK Athens, which he led to the final of the Greek Cup in 1980.
In 136 caps played with Greece"s senior men"s team, he scored 1,543 points, for an average of 11.3 points per game. He played at the International Basketball Federation EuroBasket 1965, the International Basketball Federation EuroBasket 1967, the International Basketball Federation EuroBasket 1969, and the International Basketball Federation EuroBasket 1973. He also played at the International Basketball Federation Olympic Qualifying Tournaments of 1964 and 1968.
He also played at the Mediterranean Games in 1967 and 1971.