Top Pair on a one suited flop...

[BYRNE11]

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PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($168.15)
Hero ($104.55)
UTG+1 ($42.55)
MP1 ($100)
MP2 ($51.50)
MP3 ($54.60)
CO ($54.55)
Button ($57.60)
SB ($29)

Preflop: Hero is UTG with A, K.
[color=#CC3333]Hero raises to $4</font>, [color=#666666]2 folds</font>, MP2 calls $4, [color=#666666]5 folds</font>.

Flop: ($9.50) K, 2, 7 [color=#0000FF](2 players)</font>
Hero checks, [color=#CC3333]MP2 bets $4</font>, [color=#CC3333]Hero raises to $13</font>, [color=#CC3333]MP2 raises to $47.5</font>,Hero....?