Roman Pavlyuchenko scored twice as Tottenham cruised past Bolton to set up an all-London FA Cup quarter-final clash with Fulham.
Pavlyuchenko, who was starting after hitting a double as a substitute against Wigan at the weekend, put Spurs ahead after 23 minutes with a tenacious turn and finish.
Tottenham's passage was sealed with own goals either side of half-time from Bolton goalkeeper Jussi Jaaskelainen and defender Andy O'Brien.
Pavlyuchenko then rounded off the evening with the fourth, which he slotted past Jaaskelainen after being picked out in the box by substitute Danny Rose.
Pavlyuchenko, who was making his first Tottenham start since October 27, replaced Peter Crouch up front and will have given manager Harry Redknapp plenty of food for thought. He could have a major role to play now as Tottenham bid for a top-four finish and FA Cup glory.
Bolton boss Owen Coyle also has plenty to think about, and the former Burnley manager must be worried for his team's form after another defeat.
Spurs started at a vibrant tempo and Pavlyuchenko was involved early, attempting a Dennis Bergkamp-esque turn in the box.
Jermain Defoe then linked with David Bentley down the right but Jlloyd Samuel was on hand to clear the low cross and Bolton survived the initial onslaught.
Bolton were sitting deep, allowing Sebastien Bassong time to carry the ball unchallenged from halfway before unleashing a fierce drive from 30 yards which flew just wide.
David Bentley snuffed out a promising left-wing run from Samuel and Ricardo Gardner was lively in possession for Bolton but it was Tottenham who were making all the running.
Gareth Bale surged down the left wing, swung over a ball to Bentley who teed up Bassong again but his fierce effort was blocked.
Wales international Bale then gifted the ball to Klasnic. The Bolton striker's rifled shot had Heurelho Gomes at full stretch but it flew just wide of the goalkeeper's right post.
Bolton then worked the best early chance of the game when Sam Ricketts spotted Gardner unmarked at the far post but his cross was just too high and curled out of play.
And having survived at one end, Spurs marched downfield and immediately took the lead through Pavlyuchenko.
Luka Modric slid a pass to the edge of the box where Pavlyuchenko turned Zat Knight and slid the ball past Jaaskelainen and inside the far post.
Spurs piled forward again and Defoe cut infield, away from O'Brien before unleashing a dipping shot which Jaaskelainen did brilliantly to push behind for a corner with a diving save.
But just minutes later the Bolton goalkeeper undid all his good work with a bizarre own goal as Tottenham took control of the tie.
Defoe launched himself at a low, driven cross from Defoe but Jaaskelainen got there first and deflected the ball into his own net off the inside of his right leg. Gomes then preserved the two-goal lead with a smart low save from Klasnic.
The second half was only two minutes old when Spurs took a 3-0 lead following another defensive howler from Bolton. O'Brien slid in to meet Bale's left-wing cross at the near post but succeeded only in deflecting it past the helpless Jaaskelainen.
Pavlyuchenko then tested Jaaskelainen with a turn and strike from the edge of the box but the Bolton goalkeeper caught it at the second attempt.
Eidur Gudjohnsen, a half-time replacement for Defoe, thought he had extended Spurs' lead further but his strike was ruled offside.
Pavlyuchenko wrapped up the victory with his second goal of the evening and sixth of the season. Rose played the ball into the heart of the box and Pavlyuchenko's deft touch took him away from Knight before he slotted past Jaaskelainen.
Harry Redknapp believes he may have finally got through to Roman Pavlyuchenko after watching the Russian striker fire Tottenham into the FA Cup quarter-finals.
Redknapp has been critical of Pavlyuchenko's attitude in the past and the striker was desperate to leave White Hart Lane in the January transfer window, but he is now making a case for his regular inclusion in the first-team.
"He took his goals well. He is a quality finisher and he has proven that again tonight," Redknapp said. "Last week, he was excellent in training - he was the best player in everything we did. He looked like he wanted to play.
"Nobody wants to see him do well more than me - it makes my job a lot easier. He is a very nice lad but he is laid back and some days he needs a rocket. He's playing like he's had a rocket."
Redknapp added: "He's in the team now, his confidence should be high and it is up to him to play well. He is bang in form and I wouldn't see myself leaving him out of the team at the weekend."
Bolton manager Owen Coyle was furious after what he felt was a foul on Sam Ricketts was missed in the build up to the opening goal and he did not believe that 4-0 was a true reflection of the match.
"In the build up to the first goal Sam Ricketts had been clearly blocked and when the move broke down he was out of position and Tottenham scored," Coyle said.
"We would have defended that better but it was a big moment in the game. I was fed up that we never seemed to get those decisions. They scored two goals and we scored the other two for them.
"I'm disappointed because we created a number of good opportunities, but we just need someone to finish them off. I wish Tottenham well but I didn't think that 4-0 was a fair reflection."