There is plenty of intrigue surrounding UFC 277. The event will take place on July 31 at the American Airlines Center in Dallas, Texas. The main event will see the highly anticipated rematch between women's bantamweight champion Julianna Pena and reigning women's featherweight champion Amanda Nunes. Their first encounter was memorable for being, arguably, the biggest upset in the promotion's history.Pena submitted a battered Nunes via rear-naked choke at 3:26 of the second round to become the new women's bantamweight champion. A rematch has been looming ever since.'The Venezuelan Vixen' is looking to prove that her initial win over Amanda wasn't a fluke. Meanwhile, 'The Lioness' will look to regain the women's bantamweight championship.Here's Dana White on Pena vs. Nunes II: UFC Canada@UFC_CAThe boss weighs in! Dana talks Peña and Nunes' rematch this Saturday at #UFC27794The boss weighs in! Dana talks Peña and Nunes' rematch this Saturday at #UFC277 https://t.co/6xJ4WAiJ8yBoth women most recently served as opposing coaches in season 30 of "The Ultimate Fighter." Pena won the bragging rights on TUF as three of the four finalists were members of her team.Without further ado, let's look at five adjustments Amanda Nunes must make to beat Julianna Pena.#5. Don't let the UFC 277 betting odds get to her headBet99@Bet99SportsbookJulianna Pena at +600 is the #AndNew Champ! One of the biggest odds upsets in #UFC history #UFC269Every game starts at BET99🛑 We are Responsible Gambling1Julianna Pena at +600 is the #AndNew Champ! One of the biggest odds upsets in #UFC history #UFC269Every game starts at BET99🛑 We are Responsible Gambling https://t.co/6FwmHW7m31Their first fight was a momentous upset because Pena was a significant underdog. It's possible that Nunes didn't feel threatened by her, especially considering how easily she sailed to victory against Megan Anderson at UFC 259. Amanda had been dominant for so long that she might've taken the matchup against Julianna lightly.Heading into the rematch, Nunes is once again the favorite. According to FanDuel, she is currently listed as a -310 favorite, while the women's bantamweight champion is listed as a +230 underdog.Even though 'The Venezuelan Vixen' is not as big an underdog as the first time out, 'The Lioness' is still an overwhelming favorite.To put the betting odds into perspective, a $50 wager on Nunes to win the bout would only win you $16.13. However, the same wager on Pena retaining her title would win you $115.