[25NL] - Facing Baluga Turn

[ST3]

Villian is pretty much unknown but could potentially be a weaker player because I have no hands on him.

I think turn is a call because he's pretty much repping 66, QQ and the only better 5 he can have here is A5 I think. I would expect him to raise 78, 34 or a flush draw on the flop, he could potentially c/r AQ or KQ here for thinnish value too.

River is kind of a weird spot when all draws miss and he bombs. I don't think he bets this big with AQ so he's pretty much repping A5/QQ or 66 which played the turn kinda weird. I think his range is boats or missed draws here and there's way more missed draw combos so I'm wanting to call. His turn c/r is really small and then bombing river reads to me, cheap price on draw then bomb as a bluff when misses.

Full Tilt, $0.10/$0.25 No Limit Hold'em Cash, Rush, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

CO: $25 (100 bb)
Hero (BTN): $34.72 (138.9 bb)
SB: $25 (100 bb)
BB: $39.10 (156.4 bb)
UTG: $33.33 (133.3 bb)
MP: $45.93 (183.7 bb)

Preflop: Hero is BTN with 5 7
3 folds, Hero raises to $0.50, SB folds, BB calls $0.25

Flop: ($1.10) 6 5 Q (2 players)
BB checks, Hero bets $0.66, BB calls $0.66

Turn: ($2.42) 5 (2 players)
BB checks, Hero bets $1.75, BB raises to $4.25, Hero calls $2.50

River: ($10.92) A (2 players)
BB bets $7.25, Hero?