Tewin took another step towards promotion from Division Three A after another win.
They beat Totteridge Millhillians by 112 runs to bring up their 12th success of the campaign and leave them just 37 points from guaranteeing second place.
They could still win the title too, holding a 26-point lead over second-placed Bushey.
Tewin were made to bat first and made 293-9 in their 50 overs, with 70 from Edward Fielding and 58 for Luke Wilde.
In reply the bowlers continued their stellar year, bowling the home side out for 181.
Jamie Bryce led the way with 5-50 while there was 3-36 for Ash Patel.
Datchworth meanwhile stay third in the division with a four-wicket win over St Albans.
Kieran Atkinson took 3-21 and Tom Butler 3-25 as the Clarence Park hosts were bowled out for 126.
And while they lost six wickets, they reached the target in the 41st over to stay 28 points behind Bushey, who they host on Saturday.
Welwyn Garden City remain focused on securing a promotion play-off spot in the Championship after a seven-wicket victory over Letchworth.
Jacob Logan took three wickets and there were two each for Al Mahmud Hasan, Simon Bridgewater and Radhakrishna Marripati as the visitors to Digswell Park made 147.
Welwyn then knocked off the required runs inside 27 overs with Logan the top scorer on 55 in 46 deliveries.
Knebworth Park's winning run and faint hopes of promotion from Division Two B came to end when they lost by 16 runs to WGC seconds.
Park's game was off colour from the early stages and they missed catches as the visitors started brightly before being bowled out for 187.
Charlie Randall bagged 2-29 and Dave Roberts 2-22 while Kobie Richmond managed 4-45.
In reply they struggled against good sustained pace bowling before Louis Champion (49) almost salvaged a win.
He was the ninth wicket to fall as they were dismissed for 171 with Olly Hewitt's 4-37 the pick of the WGC bowling.
Knebworth seconds are now fifth in the table and 11 points from promotion after defeating Stevenage thirds by 60 runs.
A 79-run opening partnership between Mark Woods (83) and James Hobbs (32) set the tone and was followed by 28 from Ian Pickering.
They fell away late on to finish on 213-9.
Stevenage got off to a fast start in reply but Knebworth got into their stride and starting to chip away at wickets.
Hobbs took 3-36 while Rob Burnell claimed the last four scalps to finish on 5-27, leaving Stevenage all out for 153 after 32 overs.
The thirds had a bad day, only managing 84 as they were beaten by nine wickets at Potton, while the fourths battled hard but lost by seven wickets to Bengeo.
Paul Matthews top scored with 58 while there was 32 for Ahmed Abdi as Knebworth made a decent 173-6.
Ian Murrill, Lewis Fung and Drew Myles each took a wicket but Bengeo took advantage of their wickets in hand, to reach their target with four overs to spare.
Hatfield & Crusaders lost in Division Four A, beaten by 79 runs at Old Camdenians, while Hatfield Hyde dropped out of the top two in Division Four B after suffering a five-wicket loss to Harpenden.
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