This hand crippled me in the Main Event.  It happened with 38 players remaining. I started the hand with 40BB or so. Politano cruised his way to the FT it seemed building momentum after this pot.  Best of luck to him at the November 9.

Starting Stacks
Bruno 7.5 Million
Robert 4.2 Million

Bruno Politano opened the pot with a raise to 250,000 only to have Robert Park three-bet him to 575,000 from the cutoff.

Politano made the call and then checked the  flop with Park continuing for 675,000. Politano made the call, and then both players checked the  on the turn before the  landed on the river.

Politano pushed out a bet of 1.2 million and Park snap-called.

Politano tabled his  for trips as Park flashed his  for top two pair before mucking and slipping to 1.8 million. Politano is now up to 10.4 million in chips.

1.  Please critique the hand as played.
2.  Was the 3b sizing preflop too small for this stage of the tournament.
Any other insight is welcome and appreciated. 
Thanks for input.