Song Yadong scored the biggest win of his career on Saturday when he blasted Umar Nurmagomedov with a perfectly timed uppercut that sent the Russian crashing to the canvas to end the fight. Immediately after the fight was stopped, Usman jumped into the cage to check on his brother and Song ended up colliding with him as he ran around the cage to celebrate his victory.

The brief physical altercation led many to speculate that Usman actually tried hitting Song with an elbow strike after running into each other, but the reigning PFL lightweight champion was quick to deny that allegation while addressing the incident on social media.

“People are making such a huge tragedy out of this, they should just calm down,†Nurmagomedov wrote on Instagram (Russian-to-English translation via Red Corner MMA). “There are things far worse. You don't have to think for long, just look at what is happening in the world.

“And regarding the claims that I supposedly wanted to hit his opponent, if I had wanted to, I would have hit him.â€

For his part, Song never broke stride during his celebration and he eventually went over to Nurmagomedov's corner and spoke to his head coach Khabib to pay his respects after the fight.

“You angry, petty, and jealous people,†Nurmagomedov wrote. “Your problem is that you have never had, and never will never have, an understanding of family love. If you don't know what a brother means to his brother, then I'm not the one you should feel sorry for, you should feel sorry for yourselves.â€

It was obviously a tough moment for Usman after watching his brother suffer such a brutal knockout loss — only the second defeat of his career —but Umar eventually got back to his feet and released a statement of his own saying he was doing fine after the main event ended.

Following Dillon Danis' withdrawal just two days before the event was scheduled to take place, Perry accepted the short-notice fight against Jenkins. But early in the opening round, Perry's shoulder popped out of place and while the fight was allowed to continue, it didn't take long for Jenkins to deliver the finishing blow with a nasty body kick followed by some ground and pound to end it.

“What is it 15 hours' notice?†Jenkins said after the win. “It was a no-brainer, I was coming out here. They called me, I said yes. I asked for Nate Diaz but I got Mike Perry. Hopefully I can get a good fight with Nate Diaz next.â€

Perry was on the attack from the jump with Jenkins backing him off with a slick spinning back elbow. Jus as Jenkins was gaining some momentum, Perry unloaded a combination of punches followed by a hard left hand that landed clean.

During an exchange, Perry winced after it appeared his shoulder popped out of place and Jenkins attacked with a body kick that sent the “King of Violence†down to the canvas. Replays showed that Perry's injury really was a freak occurrence as he held onto Jenkins with his left hand while through right uppercuts but it was his left shoulder that popped out of place.

Rather than stop the fight due to Perry's injury, the referee allowed the action to continue and Jenkins stayed on the attack. He unleashed another vicious body kicks that sent Perry crashing to the canvas.

Jenkins followed him to the ground where he continued hammering away with punches until the referee saw enough and stopped the fight at 2:38 in the first round.

Perry was down on the canvas for several moments as medical personnel tended to him and attempted to put the shoulder back in place as he was writhing in pain.

It's an unfortunate ending for Perry after he signed up to fight Danis but ultimately suffered a serious injury and fell to a new opponent on just 48 hours' notice. It's unclear at this time how long Perry might be out of action with the shoulder injury but his night ends on a loss while Jenkins gets the biggest win of his career.

The longtime UFC veteran decided to end his hiatus from combat sports and return for a fight in BKFC after the promotion announced plans to hold an event in the historic baseball stadium. The 42-year-old veteran didn't look like he skipped a beat as he came out guns blazing against Stash Kuykendall on Saturday night.

Right away, Lauzon pushed Kuykendall back towards the ropes and he immediately started digging to the body with hard shot before unloading a right hand that ended in a knockdown. With Kuykendall obviously still hurt, Lauzon just kept coming forward and blasting away with huge punches including another right hand that scored a second knockdown.

Lauzon earned one more knockdown but ran out of time in the first round to potentially end the fight.

On the restart, Lauzon wasted no time putting Kuykendall down again and it was clear the writing was on the wall that this fight wasn't going to last much longer.

In the next exchange, Lauzon uncorked a hellacious left hand that twisted Kuykendall's head around and he went face first down to the canvas. To his credit, Kuykendall did manage to get back to his feet but he was so badly damaged the referee Dan Miragliotta had no choice but to stop the fight with the end coming at 49 seconds into the second round.

Afterwards, Lauzon seemed to make it clear this was a one-and-done for him in bare-knuckle fighting unless BKFC decides to make a return trip to Boston in the future.

“We always fight like it's a car crash,†Lauzon said after the win. “I felt like I hit him pretty good. I've got a swollen eye but that's the way it goes. If you come back to Fenway, we'll talk about it.â€

Lauzon has always been a fan-favorite and he definitely had the home crowd on his side on Saturday for his bare-knuckle debut. It seems unlikely that he'll be back again but Lauzon lived out a dream fighting at Fenway Park and he leaves with a 1-0 record in BKFC.