Leaders Coventry stretched their lead at the top of the Sky Bet Championship to eight points following a hard-fought 1-0 win over Swansea.
Ephron Mason-Clark's emphatic finish just before half-time was enough to give the Sky Blues a ninth home Championship win of the season.
But the usually free-scoring Sky Blues were made to work hard for the points and were perhaps somewhat fortunate to have found themselves in front at half-time.
The resolute visitors had done a fine job in keeping the hosts quiet but were undone a minute before the break by Mason-Clark's opener.
It failed to spark Coventry into life with the hosts fading once again after a good spell of pressure early in the second half.
It was the visitors who enjoyed the best of the second-half chances and could well have snatched a point with better finishing after both Liam Cullen and Melker Widell wasted good chances to equalise.
It leaves City - who are unbeaten at home this season - with a commanding 13-point cushion on the chasing pack as they look to bring Premier League football to Coventry for the first time in 25 seasons.
Eom Ji-sung had a shot comfortably saved by Carl Rushworth as the visitors started on the front foot.
Liam Kitching made an excellent goal-saving block to deny Zan Vipotnik after nine minutes.
Marko Stamenic went into the book for a late foul on Jack Rudoni a minute later.
Rushworth blocked a dangerous Eom cross on minutes as the visitors continued to look comfortable.
Ellis Simms saw a header brilliantly saved by Lawrence Vigouroux from Tatsuhiro Sakamoto's 38th-minute cross.
Mason-Clark then saw his follow-up effort blocked before Matt Grimes smashed wide.
Ronald failed to make the most of a good chance for the visitors after firing hight and wide when there were better options available.
But Mason-Clark put the Sky Blues ahead with an emphatic finish a minute before the break after Milan van Ewijk's long throw was flicked on.
Vigouroux got down well to save a well-hit shot from Victor Torp in the opening minutes of the second half.
Coventry kept up the pressure on the Swans after winning a succession of quick corners.
The lively Mason-Clark had a shot blocked on the hour before Vigouroux saved Sakamoto's follow-up just after the hour.
Widell saw a shot blocked during a rare break by the Swans following Zeidane Inoussa's cross.
Cullen wasted a great chance for the visitors after failing to find the target while in plenty of space in the 71st minute.
Widell could only pick out the keeper when a brilliant pass by Malick Yalcouye cut open the Coventry defence.
The managers
Coventry's Frank Lampard:
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Swansea's Vitor Matos:
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