Gruetzemachers' mother Julia is from Chile, and her family was granted political asylum to United States with the help of United Churches after his grandfather, who was an assembly man in Chile, was arrested and tortured for three years after an uprising against Salvador Allende changed the regime in Chile. Gruetzemacher was born in Page, Arizona, United States, and at the age of five, his father, was shot and murdered in Arizona, this evoked his primal instinct for self-protection where he started wrestling. Gruetzemacher was a former student at Thunderbird High School where he started his wrestler training. He started training BJJ and Muay Thai in 2007 to get in shape and slowly progressing to compete in MMA. He chose his professional as a fighter after decided to invest his time as an athlete in combat sport and to be part of something great in his life. He worked with the former Thailand national fight team member and multiple Muay Thai world champion, Master Kru Paul, in North Carolina to sharpen his stand up game prior finding his new training base at 2 Knuckle Sports. A typical training day for Gruetzemacher involves strength and conditioning in the morning, grappling in the evening and works on this stand up game in the later of the day after teaches two BJJ classes at 2 Knuckle Sports MMA Academy.
Gruetzemacher started his professional debut in 2008 and fought most of his fights in Arizona, United States. He was the former fighter for Strikeforce and World Series of Fighting. He amassed a record of 12–1 with 11 winning streak where he won back to back wins over UFC veterans Roli Delgado and John Gunderson prior signed by UFC. Gruetzemacher took 21 months hiatus from his torn ACL injury before he stepped back to cage where he was selected as one of the contestants for UFC The Ultimate fighter 22.
Gruetzemacher was selected to be one of the contestants for the UFC TV MMA competition series,, fighters from Europe coached under Conor McGregor vs fighters from United States coached under Urijah Faber. Gruetzemacher was coached under team Urijah Faber. He faced Austin Springer on the Elimination fight and won the fight via TKO on round two. On the Opening Round he was up against Sascha Sharma and won the fight via unanimous decision. He moved on to the Quarterfinals and faced Artem Lobov and suffered a defeat via TKO. In episode 7 Gruetzemacher had a verbal confrontation after a heavy drinking session, betting shots on the billiard games, in the house between Gruetzemacher and Julian Erosa where Erosa commented Gruetzemacher's fights were the most boring in the house. The confrontation escalated and got more heated where Erosa challenged Gruetzemacher to act on his aggregation. Gruetzemacher splashes beer and water in Erosa's face. The confrontation eventually scaled down after some posturing and yelling and cooler heads prevailed with no physical fight was committed.
Ultimate Fighting Championship
Gruetzemacher made his promotional debut on December 11, 2015 at in Las Vegas, United States, against Abner Lloveras. He won the fight via unanimous decision. He next faced Chas Skelly at on February 4, 2017. He lost the fight via submission on round two. Gruetzemacher was expected to face Martin Bravo on August 5, 2017 at. He was pulled from the fight and replaced by Humberto Bandenay. Gruetzemacher faced Davi Ramos on December 9, 2017 at UFC Fight Night 123. He lost the fight via submission in the third round. Gruetzemacher faced Joe Lauzon on April 7, 2018 at UFC 223. He won the fight after Lauzon's corner stopped the fight after the second round. This win earned him a Performance of the Night bonus. Gruetzemacher was expected to face Beneil Dariush on November 10, 2018 at UFC Fight Night 139. However, on October 18, 2018, it was reported that Gruetzemacher withdrew from the event and he is replaced by newcomer Thiago Moises. Gruetzemacher was expected to face Jesus Pinedo on March 23, 2019 at UFC Fight Night 148. However, on March 13, 2019, it was reported that Gruetzemacher was pulled from the bout due to injury and he is replaced by John Makdessi..
Former UFC and WEC fighter and current Bellator fighter, Benson Henderson and Gruetzemacher are teammates and they are longtime training partner. As most his teammates and teachers could not pronounce his last name "Gruetzemacher" correctly when he was young, and they just called him "Gritz" and his nickname 'Gritz" was coined. Gruetzemacher cut his signature "caveman" long hair and donate to Wigs for Kids for those who suffered from cancer in 2017.
