Despite remaining undefeated in the league this season, securing a win against the team in 10th place was not guaranteed for Inter Turku, who had drawn three of their last four matches, including the most recent two.
After dominating the initial exchanges, Inter took the lead midway through the first half when a poor clearance was intercepted just outside the box by Joonas Kekarainen.
He aimed from 20 yards out, and his low shot was deflected past the diving goalkeeper by teammate Dimitri Legbo, marking his third goal in four matches.
The remainder of the first half and the start of the second half were dominated by Haka, but visiting goalkeeper Eetu Huutanen was up to the challenge, saving everything they attempted.
Inter had opportunities to seal the match late in the game, even receiving a penalty for a handball by Nikolas Talo with 10 minutes remaining. However, Haka goalkeeper Liam Hughes denied Bart Straalman's weak penalty kick.
Ultimately, this was not critical for Turku, who managed to hold on for a narrow 1-0 victory that brings them to 30 points, boasting not only a goal difference eight goals better than KuPS', but also having two games in hand.
The draw between KuPS and Oulu had lifted the latter off the bottom of the table for the first time since the season's early weeks, but they dropped back to 12th on Monday after KTP managed a goalless draw with Gnistan.
The home team had more possession and more shots but failed to score against Gnistan, who are now winless in their last four matches. KTP still possesses the league's weakest defense but has now recorded two clean sheets.
On Sunday, Veikkausliiga's leading scorer Kerfala Cissoko reached double digits in the league and 12 across all competitions when he put Jaro ahead against Mariehamn.
He has netted 10 of his team's 16 goals in the top division, but this effort wasn't enough for three points, as Korede Adedoyin equalized early in the second half for the visitors.
The 1-1 draw elevates Jaro to ninth place - one point and one position below Mariehamn.