Wairarapa also batted first against Wanganui and thanks to a fine innings of 83 from vice-captain Jamie Holmes and a solid 63 from Paul Lyttle they reached a competitive 230.
Holmes faced 93 balls and struck nine fours and one six while Lyttle hit nine fours in a 77-ball stay.
Wanganui looked to be well on the way to victory at 146-4 but their situation changed dramatically when they then lost three wickets for only one run.
A gutsy last wicket partnership of 48 runs almost saved the day, however, coming to an end just one run short of levelling the scores.
Calvin Ball was the most successful of the Wairarapa bowlers, maintaining a good line and length and picking up 5-38 while Brock Price chimed in with 3-19.
Short scoreboards:-
Wairarapa 188 (Burling 4, Price 1, Jarvis 11, Holmes 28, Speers 9, Lyttle 15, Rance 42, Riesima 14, Ingham 1, Ball 23, Haxton 2 not out, extras 38; fall of wickets, 6, 9. 57, 60, 86, 94, 148, 151, 155, 188; O'Conner 10-3-35-1, Baxendine 9-0-24-2, Skeaping 10-1-32-4, Macquet 5-0-27-0, Grimes 2.3-0-28-1, McGowan 4-0-31-2) lost to Nelson 189-8 (Cooper 1, Cross 0, Hay 27, McGowan 1, Clarkson 11, Edwards 81, Macquet 16, Harden 14, Skeaping 22 not out, O'Conner 0 not out, extras 16; fall of wickets 1, 1, 2, 17, 61, 82, 139, 188; Rance 10-2-20-4, Inagham 10-0-53-2, Ball 10-0-56-2, Haxton 2-0-15-0, Hook-Sporry 7-1-30-0, Holmes 1.1-0-7-0) by two wickets.
Wairarapa 230 (Burling 0, Price 18, Jarvis 2, Holmes 83, Speers 13, Lyttle 63, Rance 1, Reisima 10, Ingham 3, Ball 12 not out, Haxton 9; extras 16; fall of wickets, 4, 10, 35,63, 183, 191, 203, 207, 207, 230; Hemi 9.1-2-39-4, Blundell 9-0-42-1, O'Leary 10-0-47-4, Slight 5-0-21-0, Fraser 6-1-32-0, Collier 8-0-39-1, Smith 1-0-5-0) beat Wanganui 229 ( McIlwraith 0, Smith 45, Collier 21, Fraser 62, Steward 3, Rayner 0, Inness 52 not out, Lock 5, Blundell 1, O'Leary 0, Hemi 8 16, extras 24 ; fall of wickets 2, 50, 126, 146, 147, 147, 176, 181, 229; Rance 10-1-34-1, Hook-Sporry 9-0-49-0, Ingham 10-1-47-1, Ball 10-1-38-5, Holmes 3-0-28-0, Price 5.5-0-19-3, Reisima 1-0-7-0) by one run.