Stockton won off the last ball when they visited Blaydon. Set a target of 182, they needed one run from the last delivery and scraped home with their last pair at the wicket.
Ellis contributed 50 and Mason 49 to the Stockton total, while for Blaydon Stuart Forster had five for 53 and John Manning three for 53.
It is the third time this season that Blaydon have lost from the final ball of a match.
Batting first Blaydon posted 181 for nine with Graeme Forster scoring an unbeaten 80 while Stephen Jobling hit a half-century.
Simon Davison finished with three wickets for 65 runs and David Parr had six for 56 in the Stockton attack.
Peter Vinton (43) and Craig Harrison (34no) led Felling to 165 for seven despite Smith Jnr returning three for 25 for Gateshead Fell who responded with 132 for nine including 40 by Donkin. Douglas claimed four wickets for 36 runs for Felling.
Mark Dixon hit 124 not out and Andrew Waters Jnr made 61 off Consett's 228 for six at home to South Shields for whom Lowes had three for 37.
Moore then carried his bat for 50 and David Maughan contributed 34 to the Shields total of 165 for eight.
Paul Bond with 91 top scored when Hetton Lyons easily defeated Swalwell and South Northumberland also recorded a comfortable victory having 110 runs to spare at home to Annfield Plain who were all out for 80 when Graeme Allison captured three wickets for just five runs.
Gavin Brown with 71 and Paul Carding with 60 were the principal contributors to South North's 190 for six.
Ryon McVittie (45) and Dick Longstaff (35) were in good form for Burnopfield who finished with 158 despite David Brown picking up five wickets for 36 runs for Bill Quay.
The visitors won losing six wickets when James Phillip scored 31, Michael Finlow 30 not out and Phil Savage 30.
At Whitburn, Whickham won by five wickets as Keith Walker scored 59 of his team's 110 for five.
Batting first Whitburn made 109 as Ian Hodgson and Ian McInterey both picked up three cheap wickets.
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