Biggest MMA Upsets: Giant Vs. Underdog Fights You Won't Believe!

Dr. Elsa Howell 16 May 2025

Ever witnessed a moment so shocking, so improbable, that it redefined what you thought was possible? The world of combat sports, and particularly Mixed Martial Arts (MMA), thrives on the unpredictable, and the concept of the "underdog" achieving victory is arguably its most compelling narrative. Its a David vs. Goliath story played out in real-time, a testament to the human spirit's capacity to overcome seemingly insurmountable odds.

The underdog story is ingrained in the very fabric of MMA. Unlike other sports where size, strength, and pedigree often dictate the outcome, MMA's multifaceted nature allows for upsets of seismic proportions. A well-timed strike, a perfectly executed submission, or simply unwavering determination can propel a fighter with less experience and lower expectations to a stunning triumph. This is what makes the sport so captivating, so prone to moments that etch themselves into sporting folklore. It's a reminder that grit, strategy, and a touch of luck can topple even the most dominant of opponents.

One can't discuss underdog victories without invoking the name of Julianna Pea. A $100 bet on Pea to defeat Amanda Nunes would have yielded a staggering $700 profit, a testament to the perceived disparity between the two fighters. But Pea's victory wasn't merely a lucky punch; it was a calculated dismantling of a seemingly invincible champion, a masterclass in strategy and relentless pressure. It served as a stark reminder that in the Octagon, anything is possible.

The drama extends beyond the UFC. ONE Championship, for instance, has witnessed its share of stunning upsets. Xiong Jing Nan's battles, particularly her clash with Tiffany Teo, highlight the sheer will and determination that can even the playing field. Reliving Xiong Jing Nan's first explosive encounter with Singaporean warrior Tiffany Teo back in 2018 serves as a poignant reminder of the intensity and unpredictability inherent in women's MMA.

The odds themselves can be a barometer of the perceived imbalance. The fight between Agapova, a heavy favorite, and Shana Dobson, a massive underdog (+950), at a UFC Fight Night showcases the most significant difference in favorite vs. underdog odds ever recorded by bookmakers. Dobson's victory wasn't just an upset; it was a complete subversion of expectations, a moment that left commentators and fans alike in disbelief.

These are the stories that resonate, the narratives that capture the imagination. They speak to our inherent desire to see the underdog triumph, to witness the seemingly impossible become reality. MMA, with its inherent volatility and diverse skillset requirements, provides the perfect stage for these dramatic reversals of fortune. It's a sport where preparation meets opportunity, and where the heart of a fighter can often outweigh the perceived advantages of size, strength, or experience.

Beyond individual fights, the very structure of MMA encourages the rise of the underdog. The constant evolution of techniques, the emergence of new training methods, and the ever-increasing depth of the talent pool mean that no fighter, no matter how dominant, can rest on their laurels. A single misstep can be exploited, a weakness exposed, and a seemingly insurmountable lead can evaporate in an instant. This inherent instability keeps the sport fresh, exciting, and perpetually vulnerable to the emergence of the next great underdog story.

The appeal isn't solely limited to professional MMA. The concept of overcoming adversity resonates even in amateur and recreational settings. The sheer act of stepping into a ring or onto a mat, knowing that you're facing an opponent who may be bigger, stronger, or more experienced, requires a certain level of courage and determination. And when that determination leads to an unexpected victory, it's a moment of personal triumph that transcends the sport itself.

The element of surprise, often overlooked, is a key ingredient in the underdog's recipe for success. When a fighter is heavily favored, they often enter the arena with a certain degree of complacency, perhaps underestimating their opponent or becoming overconfident in their own abilities. The underdog, on the other hand, often approaches the fight with a laser-like focus, knowing that they need to be at their absolute best to have any chance of winning. This difference in mindset can be a significant advantage, allowing the underdog to capitalize on any mistakes or weaknesses exhibited by their opponent.

Moreover, underdogs frequently possess a unique and unpredictable fighting style. Lacking the pressure to conform to established norms, they are often free to experiment with unorthodox techniques and strategies, catching their opponents off guard and disrupting their game plan. This willingness to take risks and embrace the unexpected can be a powerful weapon, turning perceived weaknesses into unexpected strengths.

The power of belief also cannot be underestimated. An underdog who truly believes in their ability to win, who visualizes success and maintains a positive mindset throughout the fight, is far more likely to achieve their goal. This unwavering belief can provide a surge of adrenaline, allowing them to push through pain and exhaustion and to dig deep when faced with adversity. It's a testament to the power of the human mind to overcome physical limitations.

Furthermore, the underdog often benefits from the element of surprise. Opponents may have focused their training on countering more established styles, leaving them unprepared for the unique approach of the less-known fighter. This tactical advantage, combined with the underdog's heightened motivation, can create a perfect storm for an upset.

The underdog narrative also finds parallels in other areas of sports and even in life itself. We celebrate teams that defy expectations, individuals who overcome obstacles, and businesses that disrupt established industries. The common thread is the idea that with hard work, determination, and a little bit of luck, anything is possible. The underdog story reminds us that success is not always predetermined and that even those who start at a disadvantage can achieve greatness.

Ultimately, the enduring appeal of the underdog in MMA lies in its ability to inspire. It reminds us that talent alone is not enough, that hard work, dedication, and a never-say-die attitude can level the playing field. It's a testament to the human spirit's capacity to overcome adversity and to achieve the seemingly impossible. And as long as there are fighters willing to step into the Octagon with everything to prove, the underdog story will continue to captivate and inspire us all.

Consider the case of Matt Serra, a significant underdog who shocked the world by defeating Georges St-Pierre. Serra's relentless pressure and powerful striking proved too much for the dominant champion, leading to one of the biggest upsets in UFC history. Serra's victory wasn't just a fluke; it was a testament to his hard work, dedication, and unwavering belief in his own abilities.

In a similar vein, the story of Holly Holm's victory over Ronda Rousey is another prime example of the power of the underdog. Rousey, an undefeated champion and global superstar, was widely expected to dominate Holm. However, Holm's precise striking and calculated strategy completely neutralized Rousey's grappling skills, leading to a stunning knockout victory that reverberated throughout the sports world.

The rise of fighters like Israel Adesanya, who initially faced skepticism due to his unorthodox style, demonstrates how embracing individuality can lead to success. Adesanya's striking prowess and charismatic personality quickly won over fans and critics alike, propelling him to the top of the middleweight division. His story is a reminder that sometimes, the best way to succeed is to be yourself and to defy expectations.

The importance of a strong support system cannot be overstated. Underdogs often rely on their coaches, training partners, and families to provide the motivation and guidance they need to succeed. These individuals play a crucial role in helping the underdog stay focused, maintain a positive attitude, and overcome the inevitable challenges that arise along the way.

The media also plays a significant role in shaping the underdog narrative. By highlighting the stories of fighters who have overcome adversity, the media can inspire others to pursue their dreams, no matter how improbable they may seem. The media can also help to create a sense of momentum around an underdog, generating excitement and anticipation that can ultimately contribute to their success.

Beyond individual fights, the concept of the underdog extends to entire organizations. Promotions like Bellator, ONE Championship, and PFL have all challenged the dominance of the UFC, providing opportunities for fighters who may not have had the chance to compete on the biggest stage. These organizations have helped to diversify the MMA landscape, creating a more competitive and exciting environment for fighters and fans alike.

The future of the underdog in MMA looks bright. As the sport continues to grow and evolve, new opportunities will emerge for fighters to defy expectations and achieve greatness. The constant influx of new talent, the increasing sophistication of training methods, and the ever-growing global reach of the sport will ensure that the underdog story remains a central part of the MMA narrative for years to come.

The rise of social media has also played a significant role in amplifying the underdog's voice. Fighters can now connect directly with fans, share their stories, and build a following, even without the backing of a major promotion. This increased visibility has helped to level the playing field, allowing underdogs to gain recognition and attract opportunities that may have been previously unavailable.

Ultimately, the enduring appeal of the underdog in MMA lies in its ability to remind us that anything is possible. It's a testament to the power of the human spirit to overcome adversity, to defy expectations, and to achieve greatness, regardless of the odds. And as long as there are fighters willing to step into the Octagon with everything to prove, the underdog story will continue to captivate and inspire us all.

Consider the case of Eddie Hall venturing into the MMA ring, taking on not one, but two opponents simultaneously. This incredible display of strength and skill showcases the underdog spirit, someone stepping outside their comfort zone and challenging the status quo. The spectacle reinforces the notion that the seemingly impossible can be achieved with the right combination of preparation, determination, and a touch of audacity.

The world of fantasy sports also acknowledges the allure of the underdog. Platforms like Underdog Fantasy provide avenues for fans to engage with the sport in new and exciting ways, drafting teams and making predictions, often betting on the potential of the less-favored athletes to outperform expectations. This further cements the underdog's place in the sporting consciousness.

Even in the realm of online gaming, the spirit of competition and the desire to overcome challenges mirrors the underdog mentality. While some may engage in toxic behavior, the underlying drive to improve and succeed, even when facing seemingly insurmountable odds, is a common thread. The pursuit of victory, whether in a virtual world or a real-life arena, often fuels the underdog's determination.

The evolution of MMA tactics and training regimes continues to reshape the landscape, creating new avenues for underdogs to exploit weaknesses and leverage their unique skills. The constant quest for innovation means that no fighter, regardless of their pedigree, can afford to become complacent. This perpetual state of flux ensures that the underdog will always have a fighting chance.