If I recall correctly, four players saw the flop for $1 each. After the flop he opened for $2 and I was the only caller. Then he opened for $4.75 after the turn.

What I'm really looking for is feedback on the math - is my math correct, specifically the part where I calculated that I need to be a 27.7% dog to justify the call (i.e., 1/(1+2.6) )?