Spurs were flying high after thrashing Manchester United 3-0 at Old Trafford in the previous game, but Pochettino believes his players failed to come back down to earth to put in the hard work needed to beat the Hornets.
Mauricio Pochettino will hail his ability to keep all of his star players from last season an even bigger success considering the majority of them had impressive World Cups, with 9 of the starting 11 that featured against Manchester United having reached at least the semi-finals of the tournament in Russian Federation.
He continued in his press conference: "It is of course so painful to concede two goals like this, so painful that the first half looks like a friendly game". They had the same number of wins, 11 - can you see where we're going with this yet?
"If you want to be a contender you can not concede the type of goals we conceded". This is good to compare, some people talk about perceptions but the reality was on the pitch.
"The reality is if you want to be a contender, then today we should win and win easy because everything was ready to win the game", Pochettino said. "I was more upset after Monday". "When you want to win and show you are a contender you can not say we are going to play football for five minutes and in the second half we are going to win".
"We have good players in the squad".
Javi Gracia seemed an uninspiring managerial choice when he was appointed last January, but he's weathered the storm of a hard ending to last season and by Watford's standards a quiet transfer window, to come out of the blocks flying this year.
"I told everyone after the [Manchester United] game that I wasn't happy, and again we try to defend long balls and you need to show that strength, personality, character to play football and defend in the moment".