England captain Andrew Strauss says the three Tests against South Africa will be as keenly-fought as an Ashes series against Australia.
The first Test at The Oval starts on Thursday, with the recalled Ravi Bopara, 27, set to bat at six.
Strauss said from a player's point of view it is "up there with the Ashes".
The England captain added: "It's the highlight of the summer. It is hard, competitive cricket between two good sides going toe-to-toe."
Strauss confirmed Bopara would make his 13th Test appearance and his first in almost a year.
"He's played really well in the one-dayers and looks very comfortable with himself and his game. He also has the ability to bowl some handy overs for us," said Strauss.
"He's a good guy to have at six for us and I'm sure he'll be really glad to grab this opportunity with both hands and cement that spot."
If the Proteas win the series they will leapfrog England to go top of the world Test rankings.
A drawn series would keep Strauss's men at the top but the veteran batsman wants his side to aim for the win and cement their world number one status.
"This is a challenge for us to see where we're at," he said. "The rankings say we're number one. Well, we need to go out there and prove that now."
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