Ovington inflicted the season's first defeat on the Horwath Pulleyn Heselton York Vale division one leaders Burythorpe.
However, second-placed York were unable to make any major inroads into Burythorpe's lead as they endured a frustrating trip to third-placed Burn.
First, the Selby Toll Bridge jammed, resulting in key players not being able to get to the Burn ground on time.
Then, after York skipper Kevin Mendham had scorched his way to a century in his side's 199, the weather closed in with Burn on 80 for 3.
Owen Stewart (Bishopthorpe) was another centurion in the victory over Heworth while Brian Aconley had the season's best bowling analysis, 9 for 31 as Stamford Bridge won at Norwich Union to boost the survival hopes.
Bridge's hopes were also boosted by the news that Hemingbrough went down to Stockton & Hopgrove.
Drax were given a scare by Wheldrake before eventually winning by one wicket to maintain a healthy lead in division two.
Fulfordgate returned to winning ways and are second while their opponents, Thixendale, are now in the thick of the relegation battle.
Third division leaders Copmanthorpe beat Askham Bryan but were taken to the penultimate over in a tight game.
Stillingfleet, who won at Melbourne, are second, with Escrick Park, who beat neighbours North Duffield, third.
Tollerton put a halt to Huntington's unbeaten run of six weeks to go further ahead in division four.
Burton Salmon, five-wicket winners over Acomb are second while the University Staff side slipped to fourth after losing to Ovington.
Division five leaders York were taken to the wire by bottom club Copmanthorpe, winning by two runs, whereas second-placed Wistow overwhelmed Wheldrake.
The Scothern Construction Cup final between Escrick Park and Burton Salmon was abandoned yesterday without a ball being bowled. A new date is being arranged.
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