Vazaios is a two-time Olympian from Greece. At the 2012 Olympic Games, he competed in the 200 IM and placed 26th respectively. Four years later, he qualified for the semi-final in the same event and finished 11th overall with a time of 1:59.54. Vazaios also won the European Championship title in the 200 IM at the 2016 European Championships. Most recently, he placed 9th in the 200 IM at the 2017 FINA World Championships in Budapest.
Vazaios joined NC State in 2016 and had a stellar first season with the Pack. At the ACC Championships, Vazaios won the 200 IM in 1:41.25 and the 200 butterfly in 1:41.42. He also placed third in the 100 butterfly and was a part of the 800 freestyle and 400 medley relays.
At the NCAA Championships, Vazaios was one of the key players for the Wolfpack. On night one, he swam the second leg in the record-breaking 800 freestyle relay. With a time of 6:06.53, the Wolfpack took the title and broke the NCAA Record. Vazaios also swam the 200 IM and finished seventh overall. To switch his event line up from the ACC Championships, Vazaios swam the 100 backstroke instead of the 100 butterfly. It was a smart move and he ended up making the A-final and finishing eighth in the heat. His best individual placement came in the 200 butterfly where he got fifth with a time of 1:40.80.
Following a successful sophomore year, Vazaios defended his 200 IM ACC Championship title and won the event in 1:42.43. He also competed in the 200 freestyle and butterfly where he finished third and second respectively. Vazaios was also a part of the 400 medley and 800 freestyle relays.
In Minneapolis, Vazaios competed in the 200 IM, 100 backstroke and 200 butterfly. To start off the meet, NC State managed to defend their title and they broke their own NCAA Record in the 800 freestyle relay. Vazaios led off in a 1:31.32 and broke the School Record. They touched the wall in 6:05.31 with Indiana being a close second in 6:06.01. Individually, Vazaios had a great meet as he got second in the 200 IM and third in the 100 backstroke. On the last day, Vazaios won his first individual NCAA Championship title in the 200 butterfly. He swam a smart race and came from behind to win the event. With a time of 1:38.60, he became the third fastest performer of all time.
At his senior NCAA championships, Vazaios swam his same individual lineup as his junior year. In the 200 IM, he once again placed 2nd in the 200 IM, touching at 1:39.35. In the 100 backstroke, he finished 13th in a time of 45.40. On the final day of competition, he was able to defend his title in the 200 fly, using stellar underwaters and a 50.55 last 100 to leave the field in the dust and win by over a second in 1:38.57.