On a card held by Ultimate Combat Sports, Lentz submitted Jake Hoyer using a rear naked choke.

After the loss to Moreno, Lentz went on to compile a 7–0–1 record in his next 8 fights including a victory over UFC veteran, Drew Fickett.

He replaced an injured Dan Lauzon and upset Rafaello Oliveira, winning via unanimous decision with scores of 29–28, 29–28, and 30–27.

[8] At UFC Fight Night 24, Lentz fought and defeated division II national wrestling champion, Waylon Lowe.

[9] After Lowe won the first and second rounds convincingly, Lentz came back in the third and scored an impressive come from behind submission win.

However, after reviewing the incident, the Pennsylvania State Athletic Commission overturned the result and declared it a no contest.

Lentz faced Evan Dunham on January 28, 2012, at UFC on Fox 2, where he replaced an injured Paul Sass.

[18] In his second fight at featherweight, Lentz faced Diego Nunes on January 19, 2013, at UFC on FX: Belfort vs.

[20] Lentz went back to Brazil for the second fight in a row and faced Hacran Dias on May 18, 2013, at UFC on FX 8, replacing an injured Manvel Gamburyan.

Lentz was expected to face Charles Oliveira in a rematch on September 5, 2014, at UFC Fight Night 50.

Subsequently, he was initially forced to surrender 20 percent of his purse to Lentz and the bout was changed to a catchweight affair.

[28] Lentz was expected to face Thiago Tavares in a rematch on February 14, 2015, at UFC Fight Night 60.

[29] However, Tavares pulled out of the bout citing injury in late January and was replaced by promotional newcomer Levan Makashvili.

[42] However the pairing was scrapped during the weigh-ins for the event, as Lentz was stricken with "medical issues" and deemed unfit to compete.

[51] He won the fight via TKO in the second round after dropping Maynard with a head kick and following up with punches.

[56] Lentz was expected to face Nad Narimani at UFC Fight Night: Blaydes vs. dos Santos on January 25, 2020.

[57] However, the fight was scrapped due to injury and Lentz instead faced Arnold Allen, whose original opponent for the event had also dropped out.

[60] However, a member of Grundy's team tested positive for COVID-19, and Lentz instead faced Movsar Evloev on January 24, 2021, at UFC 257.

[62] After the loss, the next day Lentz announced his retirement, saying that it was due to him losing 40% of his vision after his fight with Arnold Allen, which required surgery.