The South Korean forward had not scored in the first six games of the season and looked a pale shadow of his brilliant self on the bench as Richarlison took his place alongside Kane in the starting line-up.
But in 28 minutes, Son scored a hat-trick and almost set up Kane for this second of the day and his goals ensured Tottenham have now won all their home games this season. They are also unbeaten in their last 13 Premier League games.
Kane and Dier scored in the first half while Youri Tielemans and James Maddison scored for the visiting Leicester. After the break, Rodrigo Bentancur scored his first league goal for Lilly whites before Son grabbed his hat-trick.
Here is how we rated every player on the pitch as Antonio Conte’s team climbed to the summit of the Premier League table.