Saunders was the best placed of the Kiwis in seventh overall.
The second and final day of qualifying will be sailed tonight before three days of finals, culminating in medal races in Hyeres on Saturday.
New Zealand standings after day one of the ISAF Sailing World Cup regatta in Hyeres, France, overnight (NZT):
Finn
4th Josh Junior (9, 2)
20th Andrew Murdoch (NZL Sailing Team) (11, 17)
49er
30th Marcus Hansen and Josh Porebski _ 49er (NZL Sailing Team) (8, 15, 22)
49erFX
5th Alexandra Maloney and Molly Meech _ 49er FX (10, 9, 1)
Laser
7th Thomas Saunders (4, 6, 13)
12th Sam Meech (NZL Sailing Team) (2, 12, 29)
15th Andy Maloney (NZL Sailing Team) (43, 4, 13)
54th Andrew McKenzie (2013 NZL Yachting Trust Youth Team) (3, 39, BFD)
100th Jack Collinson (48, 38, 41)
104th Michael Cate (51, 40, BFD)
Men's 470
1st Paul Snow-Hansen and Dan Willcox (NZL Sailing Team) (5, 1, 1)
11th Francisco Lardies and Luke Stevenson (20, 11, 1)
Nacra17
15th Tomer Simhony and Nicole van der Velden (24, 13)
24th Gemma Jones and Jason Saunders (19, 29)