In-form Kasey produced a number of fine saves to deny the home side, most notably a wonderful effort to tip aside Ole Gunnar Solskjaer's volley in the first half and reaction block with his feet to keep our Ruud Van Nistelrooy's close-range shot after the break.
In the end his and our makeshift defence's stubborn resistance was finally broken by Nistelrooy's clinical penalty.
The United boss reflected: "Kasey Keller had a fantastic game and it needed a penalty kick to beat him, so he can be well pleased with himself.
"I thought the performance was okay. As the game went on I was worrying about the missed chances and whether we were going to regret that because in the last 15 minutes Tottenham had a real go, Fabien Barthez had made a great cut out from a cross from the left-hand side and it was an important cut out because I think we might have lost a goal there.
"When you are only 1-0 up that's what can happen. We missed so many golden opportunities with one v ones against the goalkeeper that the scoreline was disappointing."
Sir Alex Ferguson said Kasey Keller had a 'fantastic game' and admitted that he was worried about United's missed chances as we managed to work our way into the game.