Surrey's hopes of defending their County Championship were set to take a blow as Lancashire closed on victory at Old Trafford.
Defeat for the visitors would still see them re-take top spot in the table because of bonus points, but with a lead of just single point over Sussex, who have a game in hand.
Lancashire's impending triumph keeps their faint title hopes alive, but they will need other results to go their way even if they beat Sussex at home in two weeks' time.
Lancs took just seven balls on the final morning to take the two remaining Surrey wickets.
Saqlain Mushtaq was caught behind for 11 and James Ormond was run out by Stuart Law from fine leg as he attempted to protect last man Tim Murtagh from the strike.
Iain Sutcliffe led the reply with a rapid 47, hitting nine fours in a 62-ball innings, as the home side chased 135 to wrap up victory.
Sutcliffe was caught behind off Azhar Mahmood but opening partner Mark Chilton's patient 31 not out took Lancs to lunch just 18 short of victory.
I'll be at Sheffield Wednesday at home. ITs great that sussex could win the championship but the number one priority is always the albion for me. always will be.