Britney Spears last single from ‘Circus’ has escaped the total American charts failure by debuting at The Billboard Hot 100 this week but, don’t get too happy. The song has debuted at number 90.

This is due to the increasing of radio airplay. The song is increasing very very slowly, but still increasing, it’s currently charting at #29 on Mediabase (Mediabase monitors radio stations throughout U.S. measuring songs airplay). Remember that the Medibase charts are used to build the Billboard Top 40 Mainstream as well as The Billboard Pop Songs charts.

As of the paid downloads, Radar has sold 13,780 copies this week, staying out of The Billboard Hot Digital Songs charts, at #111. In total, Radar has sold 346,748 digital copies in the U.S. So far, It is the less successful single out of ‘Circus’, since both ‘Womanizer’ and ‘Circus’ have exceded 2,000,000 sold copies each being certified 2x Platinum and ‘If U Seek Amy’ has already passed the 1,000,000 mark getting Platinum certification.

• Britney Spears Radar loses airplay and sales but climbs on Billboard Hot 100
• Britney Spears Radar almost dropping out of The Billboard Hot 100
• ‘Circus’ Song slips to #4 on U.S. Hot 100 and holds #1 on Hot Digital Songs
• “3″ goes Platinum in the U.S. + Spends 8th week on Hot 100 Top 10
• Britney Spears breaks Billboard Top 40 Mainstream Radio Airplay entries record with ‘Radar’ debut on the charts