Morton are top of League 1 on goal difference after beating previous leaders Stranraer 2-0 at Stair Park on Saturday evening.
Declan McManus scored twice at the end of the first half, one from the penalty spot, on a day when both teams finished with 10 men - Ricki Lamie and later Chris Aitken saw red.
Forfar are second following their 3-1 victory over Dunfermline at East End Park. Martyn Fotheringham, Chris Templeman and Dale Hilson (penalty) all scored in the first half but Faissal El-Bakhtaoui pulled one back.
Brechin made sure of a play-off place with a 2-2 draw at Stenhousemuir. Martin Grehan, later sent off, and Alan Lithgow had the Warriors in control early on but Andy Jackson and Alan Trouten soon responded for City.
Ayr United are out of the bottom two after seeing off relegated Stirling Albion 4-0 at Somerset Park with goals from Scott McKenna, an Adam Blakeman double and a Jon Paul McGovern penalty. The Binos had Lee Hamilton sent off.
Liam Lindsay scored the only goal with seven minutes left as Airdrieonians edged out Peterhead 1-0 at Balmoor.
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