It's a significant result in the South Group table. Surrey bounce back from consecutive defeats to pick up a third win in five games and move up to third in the table with the second London derby to come on Friday night, back at the Oval.
Essex have slipped into a hole and with just one win from five matches will do well to qualify for the quarter-finals from here. They travel to Hampshire on Friday.
But the headline writers have got what they wanted at the Oval tonight as Kevin Pietersen plays a match-winning knock on his return to English cricket. Goodnight.