Glasgow, Scotland (My Sportsbook) - American Maurice Edu scored three minutes into stoppage time and Rangers topped Celtic 1-0 on Sunday at Ibrox in the Old Firm to move 10 points clear in the Scottish Premier League.

Edu has played just four league games because of injury, but his first goal of the season has Rangers in comfortable position to win its second straight SPL title.

Rangers beat Celtic for the second time this season. Rangers won 2-1 at Ibrox in October, and earned a 1-1 tie in the teams' January meeting at Celtic Park.

"It's a massive step towards retaining the championship," Edu told the club's website. "Obviously there are still a lot of games to go but it is definitely a big step for us."

Celtic was upset in the build up to the Old Firm about decisions from referees that had gone against them in the teams' earlier meetings, and tension picked up just before the match when visiting fans interrupted a minute's silence in honor of former Rangers goalie Gerry Neef, who died this week.

Rangers goalie Allan McGregor, who was doubtful, started and was tested right away. Robbie Keane played despite a knee injury and forced McGregor to make a save just 30 seconds into the match.

Rangers settled in after the scary start, but suffered a blow in the 26th when Lee McCulloch had to leave the match. Walter Smith turned to Edu, and the U.S. midfielder capped another memorable Old Firm with the winner.

Celtic captain Scott Brown was sent off in the 66th, another decision that has the Parkhead club upset and planning to appeal, and Rangers eventually solved the 10-man visitors and goalie Artur Boruc.

Edu, who thought he scored just seconds after entering the match but lost the goal due to a foul, finished off Rangers' victory by slamming in the ball from close range following a scramble in the closing seconds.

In addition to holding the sizable lead, Rangers has played one less game, and Celtic manager Tony Mowbray knows the title is all but gone.

"As I have been saying for a few weeks, we have to keep going and try and win every game," Mowbray said. "But it's fair to say it's there for Rangers to lose."