Robin Peterson has warned England that South Africa have no intention of taking it easy after becoming the first side to top the world rankings in all three formats.
The Proteas were already number one in the International Cricket Council's Twenty20 table before replacing England on the Test summit with a 2-0 series win earlier this summer. The one-day international spot is up for grabs in the ongoing NatWest Series but South Africa moved into pole position with a decisive 80-run win at the Ageas Bowl on Tuesday.
South Africa's hat-trick of top placings is a unique feat but not one that Peterson believes will side-track them when the teams meet again at the Kia Oval on Friday, and he said: "It is definitely a fantastic honour but the hard work only lies ahead for us now."
He added: "We are pretty happy with the way we're going about our business at the moment, but we always say we are a team on a journey.
"We're not really settled at number one and we have other things we want to achieve as a team.
"It has kind of been a surprise (to top the ODI rankings) and I think it took England by surprise when they were too.
"We set certain goals for what we want to achieve but there's a long road ahead before we do that."