It was an intriguing opening round in the Malaysia Cup with Premier League runners-up Sime Darby, PKNS and Negri Sembilan causing the biggest upsets yesterday.
Second-tier teams Kedah and Johor were also able to hold fancied sides to draws.
Sime Darby condemned Armed Forces to their sixth straight defeat by edging last season's finalists 4-3 in a Group A match at Selayang Stadium.
Sime Darby stunned Forces with a third minute goal through Premier League top scorer Karlo Primorac of Slovakia while Togo's Togaba Kontiwa Komlan (24th), Hadzirun Hamid (32nd) and Fazrul Hazli (46th) each added a goal.
Forces reduced the deficit through an own goal by Sime Darby's Firdaus Faudzi (16th), Irwan Fadzly Idrus (58th) and Venice Elphi (75th).
Sime Darby coach Ismail Zakaria said: "It is a good start to our campaign. We knew Forces would come back strongly but we held our nerves for the precious win."
In Pasir Gudang, group favourites Selangor were held 0-0 by Johor.
In Group B, PKNS stunned 10-man Darul Takzim 2-0 at Shah Alam Stadium. Patrick Wleh netted a brace in the 16th and 57th minutes to take his tally to 16 goals this season.