GLASGOW (Reuters) - Scottish leaders Rangers moved four points clear of arch rivals Celtic after a goal in each half from Carlos Cuellar and Kris Boyd secured a 2-0 win at Kilmarnock on Sunday.

Rangers took the lead when midfielder Barry Ferguson headed the ball across goal in 25 minutes for Spanish defender Cuellar to loop a header over keeper Alan Combe from six metres into the right of the net.

Former Kilmarnock striker Boyd hammered home a penalty after 63 minutes to make it 2-0 after defender Jamie Hamill handled.

"It was an open game... and a little bit end to end, but with not that many opportunities.

"But the best of them, obviously, fell to ourselves. We were delighted to get the three points."

Rangers top the standings on 59 points from 24 games with Celtic second on 55 from 24.

(Editing by Justin Palmer)