When high-stakes poker players get bored, they make prop bets. And when those poker pros have each won millions at the tables, the stakes can quickly get to an absurd level. Such is the case right now between high-stakes grinders Doug Polk and David Doc Sands Sands (pictured). In a Twitter post, Polk revealed that Sands had challenged him to a fight for half-a-million dollars.

Tournament Poker Edgeis the only poker training site dedicated exclusively to MTTs and features over 1,000 training videos, blogs, articles, podcasts and a dedicated strategy forum for members. Check Tournament Poker Edge out on Twitter.

Today @Doc_Sands asked to fight me for 500k, I said yes. He needs 24 hours to get back to me. Let’s see what happens #challengeaccepted,” he Tweeted to his 7,600 followers.

Sands might have been taken aback by Polk’s willingness to throw down and the pair began hashing out the details of the bet. The fight wouldn’t be an MMA-style contest, but rather a boxing match.

Sands was willing to fight that very night, but Polk balked, claiming he needed more time to prepare. “He wanted to fight me tonight and I am not in shape enough to do so. In 24 hours we will know for sure,” he said.

Unsurprisingly, both pros’ Twitter feeds lit up with interest, with many onlookers waiting for details while discussing the potential bet. “U look pretty chiseled on your podcast… why do u need 6 months to train? Doc is some master street fighter?” asked @slaymerica. “I don’t get why he needs 6 months to train, didn’t he say challenge accepted?” he added.

$500,000 is a lot of money to risk on a prop bet, even for poker players who have made millions. Polk (pictured) reportedly was ready to agree to a $100,000 fight in 6 months, but Sands wanted to raise the stakes, countering with $500,000.

Sands and Polk have both made a large chunk of change from cash games and live tournaments. Sands is ranked 48th on the GPI Player of the Year leaderboard and has $7.7 million in live tournament cashes to his name. Polk ranks 365th on the same leaderboard and has banked $4.8 million in live tournaments.

For whatever reason, poker players have often placed big bets on physical contests. In 2009, Gus Hansen and Theo Jorgensen went toe-to-toe in the boxing ring, with the latter claiming victory and a five-figure payday.

In 2011, Lex RaSZiVeldhuis and Bertrand ElkYGrospellier faced off in a kickboxing match in Spain. The fight ended with Veldhuis landing a kick to his opponent’s head.

More recently, poker pro and MMA fighter Terrence TChanChan (pictured) and Huck Seed to test their wrestling skills during this year’s WSOP. That friendly confrontation was never finished due to security guards breaking up the fight.

While it’s still not clear if the fight will actually happen, Polk’s most recent Tweet indicates that it probably won’t. “After talking with @Doc_Sands, we are unable to reach an agreement on time frame. He wants within 4 weeks and I want 6 months to train,” he said.

Polk wanted to make it clear, however, that there was no ill will between him and his potential opponent. “I also want to say that I have no problem with @Doc_Sands. I think he is a great guy and this wasn’t because we were beefin,” he said.

We’ll keep you updated if there are any new developments.

Want the latest poker headlines and interviews? Follow PocketFives on Twitterand Like PocketFives on Facebook.