Hampshire pulled off a dramatic tie against Surrey in Southampton, ending the leaders' unbeaten run in a match that went down to the final ball. Nancy Harman's explosive 43 from 26 balls set up a tense finish, while Surrey's Alice Davidson-Richards scored 40 as the visitors struggled on a slow pitch.

Amanda-Jayde Wellington's 3-25 kept Surrey competitive, but Hampshire's chase fell short when Rhianna Southby was run out attempting a second run on the last ball. The result marked Hampshire's second tie in four games this season, showcasing how evenly matched these teams remain despite Surrey sitting top of the table.

Elsewhere, Durham posted 140-5 with Bess Heath hitting a T20 career-best 61 from 39 balls. Mady Villiers and Katie Levick starred with the ball as Durham secured victory over Warwickshire, who were bowled out for just 113 in 19 overs.

Somerset suffered their first loss of the summer as Lancashire chased down 137-6 inside 16 overs. Sophie Luff's 42 went in vain as Eve Jones and Lanning combined for nine boundaries during a devastating 62-run powerplay that propelled the hosts to victory.

These results shake up the standings significantly, with Surrey's slip allowing other contenders to close the gap while Hampshire's ability to force ties demonstrates their fighting spirit in tight matches.