Victory was Wigan's second on the bounce after they booked their place in the FA Cup quarter-finals with a 4-1 win at Huddersfield last weekend.
Those victories have come after the club went to Tenerife for some warm-weather training that Martinez believes could be a turning point.
"After the warm-weather training I think we have re-focused," he said. "The first game back was against Huddersfield in the FA Cup. You have seen a large amount of players representing the club in both games.
"You can see our competitive edge, a focus and a real responsibility in the performance.
"It is a matter of keeping a winning feeling and keeping those standards.
"This was the last game in February and for us to be involved in two competitions is a good position to be in.
"We have to concentrate on winning our trophy in the league which is staying in this division, and every game is vital."