Harry Kane scored a fourth double in a row against Everton for Tottenham as they came from behind to thrash the Toffees 6-2 at Goodison Park.
Everton took an early lead on Merseyside, thanks to Theo Walcott's opener, but a Jordan Pickford mistake allowed Son to equalise for Spurs.
Spurs were looking much better after a poor start, and Dele Alli made it 2-1 to the visitors before Harry Kane gave his side a two-goal cushion.
Christian Eriksen's excellent half-volley sent the travelling fans into ecstasy, but Gylfi Sigurdsson offered Everton an immediate response against his former team.
Son scored Spurs' fifth after some great work from Erik Lamela to effectively end Everton's hopes, and the South Korean was then a provider for Kane to score his second.
How it Happened
Dominic Calvert-Lewin's cross for former Arsenal man Walcott gave the Toffees an early lead, rewarding their bright start to the match.
Calvert-Lewin then thought he'd scored for the hosts, but he was punished for a push on the back of Davinson Sanchez and the goal was disallowed.
However, the lead was not a lengthy one with Son capitalising on Pickford's error, but the finish was very good from a tight angle.
Spurs were in the ascendancy and Moussa Sissoko's through ball found Son again, this time Pickford saving well but Alli followed up to finish well and give the visitors the lead on Merseyside.
Kieran Trippier's free-kick rebounded off Pickford's post for Kane to convert into an empty net and suddenly Spurs were running away with it.
Alli was blown offside not long after but Pickford still slide tackled his England team-mate and the attacker was taken off for Lamela at half-time with an assumed injury.
After the break, Eriksen scored a very well-taken half-volley to seemingly put the game out of Everton's reach.
Sigurdsson offered Everton an immediate response, though, with his shot rather poorly dealt with by Hugo Lloris.
Everton then had a strong spell, perhaps their best in the match as they searched for some sort of route back in the game.
But they couldn't take advantage of it and they soon found themselves three down again when Lamela played Son through, who finished clinically.
Son was having an outstanding evening at Goodison and he then set up Kane for his second with a lovely low-cross for the England striker.