Merkel's conservative bloc of the Christian Democrats (CDU) and Christian Socialists (CSU) improved its results compared to the previous poll, receiving 37 percent (35 percent in early April), while Schulz's SPD worsened its results, receiving 29 percent (32 percent in early April).
The German Left Party (Die Linke) maintains 9 percent of the respondents' support. The Green's party is favored by eight percent, as well as the right-wing Alternative for Germany (AfD) party. The Free Democratic Party (FDP) is being supported by six percent of respondents.
The poll was conducted on April 25-27 and involved 1328 respondents.
Germany's federal elections, which will elect a new government and chancellor, are slated for September 24, 2017.