Lentz is coming off his most exciting win in the UFC, a come-from-behind submission over Waylon Lowe at UFC Fight Night 24. The win moved his unbeaten streak to 14 fights, with a 5-0-1 mark inside the Octagon.
Oliveira looks to bounce back from the first loss of his career, suffered at the hands of top contender Jim Miller at UFC 124 in December. The kneebar submission loss halted a 14-fight winning streak to kick off his career, highlighted by exciting submission wins over Darren Elkins and Ultimate Fighter season eight winner Efrain Escudero in the UFC.
Grant has alternated wins and losses since joining the UFC in 2009, and looks to bounce back from a loss yet again in this fight with Riddle. The most recent loss came to Ricardo Almeida at UFC 124 in Decemeber, and he'll look to avoid losing two straight for the first time in his career.
Riddle as well looks to bounce back from a decision loss at UFC 124, his to debuting welterweight Sean Pierson. The Ultimate Fighter season seven veteran has fought all of his career fights in the Octagon, going 5-2 since his debut in 2008.
UFC on Versus 4 is headlined by a welterweight bout between Nate Marquardt and Anthony "Rumble" Johnson, and takes place from the Consol Energy Center in Pittsburgh, Penn. on June 26.