Jason Mercier called on the button. Sam Stein popped it to 21,000 and Mercier moved all in for about 148,500. Stein insta-called and the hands were:

Stein:
Mercier:

The flop came and Mercier was drawing thin, needing either a queen to make a straight or runner-runner to make two pair. The turn was the Mercier was down to three outs.

Alas, the river was the and Mercier made the ace-high straight to double up to about 300,000.