Champions Dundalk followed up last Friday's victory over Shamrock Rovers with a convincing 3-0 win away to Waterford last night.
Vinny Perth's men made an unconvincing start to the season, but they are back to their old selves and this game never looked in doubt once Michael Duffy gave them the lead two minutes before half-time.
Second-half goals from Jordan Flores and Duffy added a sheen to the scoreline, while Waterford were reduced to ten men with the 62nd-minute dismissal of Bastien Hery.
Cork City's troubles continue after the Leesiders were held to a draw against bottom side Finn Harps at Turners Cross.
Kevin O'Connor gave Cork the lead early in the second half but Keith Cowan levelled to ensure a share of the spoils.
Cork City have never finished lower than second in the past five seasons but they currently sit eighth.
At Belfield, second-half goals from Dante Leverock and Regan Donelon gave Sligo Rovers a morale-boosting 2-0 victory over UCD.