Nigel Mansell has hailed Ayrton Senna has his "toughest rival" and a driver who "stood out" even amongst great drivers.
May 1st marks 20 years since triple World Champion Senna was killed when he crashed while leading the 1994 San Marino Grand Prix.
His death, which came a day after Roland Ratzenberger died during the Imola weekend's qualifying, sent shock waves through the motorsport world.
On Thursday, the Imola circuit will open its doors to the public in celebration of Senna's life.
Remembering his former rival, Mansell told BBC Sport: "Ayrton was our toughest rival.
"He would leave no stone unturned to get the utmost out of his car and his team.
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