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Their Super Smash matches against Central Districts were abandoned without a ball bowled in either fixture.
The Sparks will have to wait a week before they get the opportunity to play again.
They will face Auckland in their last round-robin match and will get to finish their twenty20 campaign in front of a home crowd in Dunedin.
The Sparks are out of contention but the Volts are still firmly in the race.
They picked up two points for the abandoned game and their next assignment is against Central Districts in Napier on Thursday.
It will mark the midpoint in their campaign.
"At the end of the day, it was not a hugely influential result," Walter said.
"It hasn’t knocked us back. We stay in the upper rungs and it probably means that we need to win three of the next six games to get into a playoff — if the last three years are anything to go off."
There was plenty of cricket around the rest of the country. In the women’s competition, Auckland beat Northern Districts by 24 runs at Seddon Park.
All-rounder Arlene Kelly top-scored with an unbeaten 41 to help Auckland post a competitive 148 for five. Bernadine Bezuidenhout did her best to drag Northern Districts through for the win with 77 not out. But she lacked support and her side was restricted to 124 for seven.
Competition front-runner Wellington clinched an important four-wicket win against Canterbury at the Basin Reserve.
The visiting side scored 149 for four, Emma Bermingham leading the way with 65 not out. But Wellington opener Rebecca Burns helped steer her side to victory with a powerful 62.
In the men’s competition, Wellington beat Canterbury by 65 runs at the Basin Reserve after Michael Bracewell, who top-scored with 69, and Adam Hose (54) steered the home side to 200 for five after 20 overs. Cole McConchie’s 83 was the only score of substance in the Canterbury reply, as Ben Sears took four for 16. Northern Districts won a thriller against Auckland in Hamilton.
Daryl Mitchell scored 78 to guide ND to a modest 155 but Scott Kuggeleijn then took four for 18 to get the home side home by two runs.