The Rio Olympians were competing at the EA Race Walking 20km event in Podebrady.
The women went off 45 minutes ahead of the men, and Oosthuizen ended up seventh to wrap up her month-long Slovakian sojourn.
She returns to South Africa on Tuesday with the satisfaction of having equalled her own SA mark of 1hr 34min 49sec.
“The race was everything I could have asked for, perfect weather, extremely good conditions in every aspect,” Oosthuizen said before she headed home.
“I also had the amazing privilege to be accompanied by the Olympic 50km gold medallist coach from Slovakia (Matej Spišiak) and their team – he was standing in for my coach Carl Meyer for the month I was in Slovakia, as we have a very good relationship with the Slovak race walkers.”
Winner of the women’s race, which had just over 40 entrants, was Colombia’s Sandra Viviana Galvis in 1:30:00.
On to Snyman who was in Europe after a good start to his season in Adelaide, Australia. He ended fourth in 1:22:01, as Germany’s Christopher Linke won in 1:18:59.
“Training has been going well. I’ve had good solid 130km weeks and two 10-day blocks of good speed and sharpening up, and I’m also working a bit more in the gym now. The faster the races get, the more I need to do gym work.”
Like Oosthuizen, Snyman will also head back on Tuesday and prepare for nationals.
“I don’t think my legs will be fine by then, but let’s see. I am taking it race by race and that will be nice on home turf and with people supporting me.”