Bognor suffered final day heartbreak as they missed out on the Ryman premier division title in agonising fashion.
The Rocks looked set to overhaul Havant and Waterlooville and snatch the one automatic promotion spot when Jimmy Muitt fired them into the lead against Metropolitan Police 13 minutes after the break.
With Havant being held 0-0 at Kingstonian the stage was set for a huge party at Nyewood Lane but Will Salmon equalised with 19 minutes to go to shatter their dreams.
The emotions at Leylands Park were in complete contrast as they scored a last-gasp winner to avoid relegation from Ryman premier.
Will Miles had given the Hillians a 19th-minute lead against Merstham but they looked doomed when Simon Cooper equalised two minutes from time only for Sam Fisk to pop up in injury time to spark wild celebrations as Harrow Borough went down instead.
Whitehawk secured their National League south safety with a match to spare.
A 2-0 home win over Poole combined with Gosport Borough drawing 2-2 at Concord Rangers means there will be no nerve-jangling final day decider at Gosport next week.
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