Marterer made his ATP main draw debut at the MercedesCup in Stuttgart where he was given a wildcard into the singles event. Marterer won his first ATP Challenger Tour singles title at the Morocco Tennis Tour in Meknes.
He made his ATP main draw debut at the 2014 ATP Vegeta Croatia Open Umag in the doubles event, partnering Dino Marcan, losing in the first round to the second seeds Pablo Cuevas and Horacio Zeballos in three sets. In 2016, he made his first appearance in an ATP singles draw – also in the Croatia Open – losing in straight sets to Teymuraz Gabashvili.