Daniel Negreanu was so close to chipping away a big chunk of Doug Polk’s $600,000 lead on Day 13. He was cruising along up big for the session. And then he lost most of that profit on the final hand of the day thanks in part to a questionable river call.

Daniel Negreanu played well on Monday, but only won a small amount. (Image: YouTube)

Monday’s session lasted just over 2 hours and 15 minutes, perhaps shorter than it would have if not for the last hand. The poker pros have agreed to play for at least two hours per day. After that point, either player can call it quits at any time.

Entering the session, Polk had won four straight sessions by at least $117,000, including his most recent $332,178 win on Saturday. That brought his total profit for the challenge up to $596,197 through 5,751 hands out of 25,000 (potentially only 12,500, however).