This guy seems quite tight PF, but is betting almost every time post flop, OOP or IP, so the re-raise on the flop was a simple decision. From memory this is the first time he's called my button raise, then called the flop raise, so he's probably got something decent.

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.15/$0.25
4 players
Converter

Stack sizes:
UTG: $28.25
Hero: $23.05
SB: $24.50
BB: $63.15

Pre-flop: (4 players) Hero is Button with
UTG folds, Hero raises to $1, SB calls, BB folds.

Flop: ($2.25, 2 players)
SB bets $1, Hero raises to $4, SB calls.

Turn: ($10.25, 2 players)
SB checks, Hero checks.

River: ($10.25, 2 players)
SB bets $9, Hero raises all-in $18.05, SB calls.

Results:
Final pot: $46.35