Going to Aland and getting a point against Mariehamn was a decent start by last season's playoff winners, and they cemented that by holding on to all three points in their first home game back in the top flight.
The opening goal arrived on the stroke of half-time, as Lahti failed to clear a ball that was ricocheting around their box, before Eetu Turkki headed the ball across goal for Theodoros Tsirigotis to nod home.
Tsirigotis then turned provider five minutes into the second half, finding Marius Konkkola who netted his first goal since these two sides met in the Liiga Cup in January.
Momodou Sarr was the match winner in Lahti's opening game away at Jaro, but his goal 16 minutes from time only served to be a consolation this time, as the Turku side held on to win this battle of newly-promoted teams.
Following a 3-0 loss to HJK on the opening weekend, SJK have hit back by cruising to a 3-0 win at home to Mariehamn.
The opening goal just before the half-hour mark was all too simple - an inswinging Kasper Paananen was headed home in the centre of the six-yard box by Kelvin Pires.
Seven minutes into the second half, it was 2-0 to the hosts after Salim Yussif went on a driving run through the middle before laying the ball off to Paananen, who still had to shrug off challenges before slamming his finish past the goalkeeper.
And the icing on the cake arrived in the 90th minute, as Paananen's replacement Elias Mastokangas found another substitute, Jeremiah Streng, who rounded off a positive evening for the Seinajoki side.
There were no goals in Vaasa, as VPS played out a second successive goalless draw to begin their 2026 campaign, while Jaro picked up a first point but are also awaiting their first goal of the season.
The stalemate was not for the want of Jaro's trying, as they had 18 shots across the 90 minutes, but all five on target were dealt with by Mamodou Jalloh in the home side's goal.