Paul Lambert's men registered a 6-1 win over fellow relegation candidates Sunderland on Monday, which left both clubs, as well as Newcastle United, level on 37 points.
Wigan currently sit 18th in the table, five points behind their relegation rivals although they have played one game less, and Martinez believes it will be "dangerous" if the battle for the drop was decided on the final day of the campaign.
"We wanted Aston Villa to have a very strong ending to the season," Martinez told reporters.
"The reason for that is I don't think it would be healthy for any of the teams go into the final game of the season as a final, a showdown, where one of the teams has to get relegated. I think that would be very dangerous.
"As it stands now I think it shows the fight goes a bit further than two teams.
"I think that is only a positive for every team involved in that.
"It is great for us that the fight to avoid that third place is more open than just two teams."