After spending all week in Southwark Crown Court this week, Redknapp returned to the dugout to find his Tottenham team in disarray. The Barclays Premier League title chasers put on a woeful display in the first half and only went through thanks to Rafael van der Vaart's fortuitous 30-yard drive just before half-time.
"How we won that game I will never know," said Redknapp. "It's better to be lucky than good sometimes and we were lucky today, that's for sure."
He added: "We never played - we didn't pass the ball - and they played really well. They pressed us and passed it so how they lost I don't know.
"It is difficult to put your finger on it. We always move the ball well but tonight we were giving it away. We just never got going.
"We were hanging on in the end, just hanging on. That game was as tough as any we have had away from home. We have a great away record normally but we just rode our luck."
Watford, who sit 35 places below Spurs in the league ladder, looked much the sharper side and rattled the woodwork twice in the second half.
Hornets boss Sean Dyche, who is in his first year in management, was proud of his team's efforts.
"I felt we were good value," he said. "We worked hard to get reward from our performance and we so nearly did. But credit to them, they found a way to win and sometimes that's what you need to do.
"We are disappointed not to get anything from the game. The minimum we deserved was a replay and we could have won it but there were a lot of positives. Six who started were Academy products and that's important to our club."
Source: PA
Source: PA