Abentung, who belongs to SV Natters , sat on a luge for the first time at the age of ten and has participated in junior races since the mid-1990s. After a twelfth and a seventh place at the junior world championships in 1996 and 1997, he won the junior world champion title in 1998 both with the team (next to him Veronika Halder and the double linger / linger ) and in the single seater. Due to the successes in the junior division - in 2000 the Austrian won his second single-seater title - Abentung received his first appearances in the adult world cup early on . In retrospect, he described the first time in the national team from 2000 to 2006 as “hard learning years”, as he was only able to achieve good results sporadically. The best individual result in this time was an eighth place at the World Cup in Altenberg in 2002; He also won the bronze medal with the team at the 2004 European Championships.
Overall, Abentung drove into the extended world elite in these years. In this he established himself in the winter of 2006/07 , his best season to date, which he finished tenth in the overall World Cup standings. He had previously placed in the top ten four times; only at the home world championships in Innsbruck-Igls did he drop to 20th place. In the following 2007/08 season, the Austrian improved one more time. He finished seventh in the overall World Cup, finished fifth in the single-seater at the European Championships and also won the silver medal with the team at both the European and World Championships. These two silver medals remained Abentungs greatest successes in the adult sector. After a mediocre season 2008/09, which he finished tenth in the overall World Cup, he lost the connection to the top of the world in the following winter and qualified neither for the Winter Olympics in Vancouver nor for the European Championship. On October 2, 2010, Abentung announced his retirement on its website .