DJ Chris Evans has lost more than one million listeners in just three months, according to the latest figures.
The BBC Radio 2 star attracted 8.48 million listeners to his breakfast show last quarter, down from the previous period's record total of 9.53 million.
But his audience is still bigger than his predecessor Terry Wogan's 8.1 million when he bowed out, and Evans (44) remains the king of breakfast radio.
He was able to see off the challenge of his Radio 1 counterpart Chris Moyles, who had 7.72 million weekly listeners -- down on the previous quarter's record figures of 7.88 million.
BBC Radio 4's flagship Today programme also notched 6.98 million weekly listeners, its biggest ever audience and an increase from 6.44 million in the first three months of 2010.
According to industry body Rajar's data, the World Cup helped to boost numbers.
Official figures showed 10.4 million people tuned into Radio 4 every week in the second quarter of this year -- up from 10 million in the first three months of the year.
The effects of the World Cup and Wimbledon as well as the UK general election were reflected in the 6.76 million who tuned into Radio 5 Live.
That is up from 6.48 million in the first three months of the year.
The World Cup effect also benefited talkSPORT which got record listening figures of 2.5 million in the second quarter.