Holz had his first live cash in 2012 at the €500 No Limit Hold'em GPT II Deepstack Series Main Event, where he finished second for €15,320. Holz plays online under the alias CrownUpGuy. In September 2014, he won the World Championship of Online Poker for $1.3 million. In 2015, Holz finished 25th in the World Series of Poker Main Event, cashing for $262,574.