Sebastian Vettel achievement 'would top Michael Schumacher'

Sebastian Vettel winning a fourth consecutive world championship would be a "greater achievement" than when Michael Schumacher did likewise for Ferrari, according to Nigel Mansell.

The 1992 world champion expects the Red Bull driver to wrap up the 2013 championship before long, and says the 26-year-old's achievement will be "mega".

Schumacher won five of his seven F1 drivers' titles in succession - from 2000 to 2004 - and Vettel will win his fourth on Sunday if he is victorious at the Japanese Grand Prix, with Ferrari's Fernando Alonso finishing lower than eighth.

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