There was great intrigue as Jose Mourinho began life as Tottenham Hotspur coach in the dugout at the London Stadium, with his Spurs side running out 3-2 victors, although the match was far more comfortable than the scoreline suggests. He had an instant impact. He did what I wanted him to do after two days of work.
Spurs ended a series of five Premier League matches without a win and Mourinho said he was pleased with his players' response to the managerial change.
After replacing Mauricio Pochettino on Wednesday, the former Real Madrid coach had very little time to prepare his squad for such an important match, yet West Ham did much of his work for him with an terrible first-half display.
Mourinho was delighted with the 23-year-old's performance, saying: "I'm happy with him, I spent a few minutes with him in training and outside the pitch".
Alli did well to keep the ball in, setting Son free at the same time, and the latter's cross was rammed home at close range by Moura.
For a period of time it looked like it could have been as big a win as Spurs wanted, but West Ham at least restored some pride in the 73rd minute.
"I think we are lucky", Mourinho said, "that I have so many years in the Premier League, that I told the players at half-time, even if we score 3-0, minute 85 the game will be open".
"It's been a very tough week for us emotionally", Alli told BT Sport.
Having lost his first ever competitive game as manager, with Benfica in September 2000, Mourinho has gone unbeaten in his first game in charge at each of his eight clubs since (W5 D3). That the decision did not hurt the new manager as his team got all three points despite a late home fightback by the Hammers.
After Kane had an early effort ruled out for offside, South Korean Son put the visitors ahead on 36 minutes, sweeping by Papa Diop and firing past West Ham's unconvincing keeper Roberto for his sixth goal in as many games.
Dele Alli found himself in space and played a through ball to the South Korea global who notched his sixth goal in six games in all competitions.