Blackheath dropped from first to third in the Shepherd Neame Kent Cricket League Premier Division after a six-wicket loss at Bromley.
Duncan Willets top-scored with 34 as Blackheath were dismissed 150 with Imran Qayyum taking 4-33.
Miguel Barbosa (41) and Freddie Wilson (40 not out) led the Bromley reply to condemn Blackheath to a second consecutive defeat.
Hartley now share top spot with Tunbridge Wells after a winning draw in a high-scoring clash against visiting Beckenham.
Kent opener Joe Denly scored 93 while Nick Hendrie made 55 and Scott McKechnie 52 not out as Hartley posted an impressive 335-5 from their 55 overs.
Raza Ali Dar (83), William MacVicar (63) and Oliver Howick (66 from 39 balls) took the attack to Hartley but the run-chase finished just short on 331-6.
Tunbridge Wells beat Sandwich Town by 10 wickets after chasing down 123.
Young Kent wicket-keeper Ryan Davies (48), Dan Evans (36) and Rory Smith (13) were the only players to reach double figures as Alex Williams took 4-26 and Chris Williams 4-44.
Alex Williams completed a fine match by scoring an unbeaten 91 from 65 balls while opening partner Nick Selman made 36.
Folkestone registered their first win of the season after beating visiting Bexley by five wickets.
George Haley scored 54 as Bexley were restricted to 212-9 from their 55 overs with James Strang (3-26) and Himanshu Waingankar (3-44) doing most of the damage.
Waingankar (51) led the successful run-chase with Kent all-rounder Darren Stevens chipping in with 44 and Sam Ireland 45.
Bottom side Lordswood suffered a three-wicket loss at home against Sevenoaks Vine after making 148 with Chris Piesley scoring 70 of them. Karl Pearson took 5-26.
Opener John Bowden (43) and Miles Richardson (63) guided Vine home despite Piesley taking 3-6.