Glentoran 0-0 Coleraine
Glentoran missed the chance to end Coleraine's unbeaten start to the season.
The Glens were awarded a last-gasp penalty, but McGuigan slipped taking his kick.
This match always promised to be one that had a mouth-watering backdrop - a Glens side resurgent and finding confidence under manager Gary Haveron, against a Coleraine side with a perfect 100% start to the League season.
However the Bannsiders' hopes were hit on 15 minutes when Josh Carson received a straight red card for a lungeing challenge.
Robbie McDaid connected superbly with a header for the Glens in the second half, but he was denied by a superb save from Coleraine's Chris Johns.
Coleraine came close to a crucial goal on 77 minutes, but Harkin's effort from a McGonigle ball, rebounded back off the post.