Ian Bell and Jonathan Trott shared a second-wicket partnership of 141 to lift England to a comfortable six-wicket win over South Africa in the fourth one-day cricket international at Lord's.
South Africa were restricted to 220 for eight but when England captain Alastair Cook was bowled lbw by Dale Steyn for just two that total looked a long way off for England.
However, Bell and Trott, who was struggling with a hand injury, recorded their fourth century partnership to set England on their way to reach their target with 20 balls to spare and take a 2-1 lead in the five-match series.
England extended their lead at the top of the ODI rankings with the win and South Africa, the world's top-ranked test teazm, slipped to third.
The final match of the series is at Trent Bridge on Wednesday.