[2][3][4] Among his achievements at club level are several Spanish championships and cup titles and he also won the EHF Champions League, the top continental competition in Europe two times (2005, 2011).

When he was sixteen, he was given the option to move to the United States to become a professional basketball player, however, he decided to stay and pursue his handball career.

[1] With the Spanish team he developed into a quality player, known for his creative play, excellent passing skills and powerful shots.

[8] He played for the club for over ten years and has won almost all possible titles with them, both on the domestic and continental level, including the EHF Champions League trophy in 2005 and 2011.

Although, having announced his retirement from the national squad on 9 October 2017, he represented Hungary two more times against Slovenia during the play-off of the European qualification for the 2019 World Men's Handball Championship as it was widely believed that the outcome of the play-off would significantly determine the forthcoming years of Hungarian men's handball.

He also said he had had talks with Hungarian Handball Federation chairman László Sinka, in late 2009, and was told that things were going to change.

[20] However, at the same time, Nagy received a contract offer from Hungarian powerhouse MKB Veszprém KC, which he accepted, claiming he planned his future in Hungary.

[21] Nagy made his international return on 10 June 2012 in a 27–21 World Championship qualifier victory over Norway, contributing with six goals to the success.

His brother, Levente Nagy is also a professional handball player; he plays for Hungarian First Division side Kecskeméti SE.