Crowther slows Heath
Heath managed only 13 points at home to Louth who restricted them to 199 for eight, Brett Houston hitting 55 for the hosts.
Crowther's score helped Louth end their 50 overs on 152 for seven to keep them in third place in the table.
It was all change once again in the middle of the table as victory over Grimsby lifted Woodhall Spa from sixth to fourth.
Grimsby slipped one place, as did Lindum, while Sleaford moved up to replace Market Deeping in seventh.
At Jubilee Park, Warren Nel took his total runs for the season over the 800 mark with an innings of 64 and Sam Evison was unbeaten on 58 as Woodhall finished their 50 overs on 205 for six.
Grimsby were then bowled out for 167.
Bourne finally got among the runs after a couple of lean weeks, chasing Nettleham's 193 for eight to win by three wickets. This moved Bourne above their opponents into ninth place but Nettleham have two games in hand and both are well above Messingham and Caistor, the two relegation-threatened teams.
Of these two, Caistor gained the best result, holding Market Deeping to a draw in a close game at Outgang Road. The home side batted first and reached 196 for nine, a total Caistor failed to achieve by just 12 runs, finishing 184 for six with Sahan Wijerathne hitting an unbeaten 51.

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