Career
Halenár, a native of Trnava, moved to Bratislava at the age of 18, when he joined Slovakia"s reigning champions, Inter Bratislava. He impressed in the 2004-2005 campaign, in which he scored 12 goals for the club in the Corgoň Liga. Following the first game of the new season, in which he bagged two goals against MFK Ružomberok, Halenár transferred to Artmedia for an undisclosed fee, reported to be in the region of 20 million Slovak crowns.
In only his second game for Artmedia on 27 July 2005, he scored a hat-trick against Celtic in the 2005 Union of European Football Associations Champions League second qualifying round tie.
In summer 2008, Halenár was sold to Slovan Bratislava. The striker scored two goals on his debut for Slovan in a 4–1 victory against 1.
Football Club Tatran Prešov. He became the top all time scorer in the Slovak top flight on 10 August 2014, when he scored a brace against MFK Košice, surpassing Róbert Semeník"s record of 120 goals.
In January 2015, Halenár left the Slovak league and signed for Hungarian team Nyíregyháza Spartacus Football Club, where he stayed until the end of the season. Afterwards, he joined Saskatchewan Sigma Olomouc on 9 July 2015.
In December 2015, he left the club due to family reasons. Halenár played at two youth tournaments for his country, the Union of European Football Associations European Under-19 Championship in 2002 and the Under-20 Fédération internationale de football association World Youth Championship in 2003.
On 13 November 2007, he made his debut for Slovakia"s senior team in a qualifying game for the 2008 European Championship against the Czechoslovakian Republic.
Halenár also played in next two matches of the national team, when he came on as a substitute both against San Marino and Hungary.