He finished 13th at the 2006 World Junior Championships but, while practicing following the event, he broke his left leg when he hit a rut in the ice.

Having fallen and broken his left shoulder while working on a modified spin, Liebers underwent an operation in the second half of August 2014.

The following month, he won gold at the Winter Universiade in Granada, having climbed from fourth in the short program to finish ahead of Takahiko Kozuka and Artur Gachinski.

He dropped out of his next CS event, the 2015 Finlandia Trophy, due to an adductor strain and later withdrew from his GP assignments, the 2015 Skate Canada International and the 2015 Rostelecom Cup, and the German Championships for the same reason.

[10][11] On 20 December 2015, the Deutsche Presse-Agentur reported that Liebers had ended his season, the injury being more serious than initially thought.

[12] As a result of a gap in the acetabulum, caused by a fall, he underwent an arthroscopic operation on 23 February 2016 and was expected to rest for six weeks.