The Spanish summer signing coolly slotted home the only goal of the game from 12 yards to keep Spurs' stringent yet winning start to the Premier League campaign rolling against an atypically reserved and cautious Swans set-up.
The spot kick was the second time Jonjo Shelvey appeared to bring down Andros Townsend inside the penalty area - the first came in the latter stages of the first half with referee Neil Swarbrick again calling the foul but wrongly ruling that it occurred outside the box.
Neither incident was by any means stonewall, either - but Andre Villas-Boas's side deserved all three points after an assured performance featuring impressive contributions from Soldado, Paulinho, Kyle Walker and Danny Rose, to name but a few.
PRE-MATCH: None of the Spurs players who contributed their last 12 PL home goals start. Gareth Bale, Emmanuel Adebayor and Aaron Lennon are not in the squad, Jermain Defoe and Gylfi Sigurdsson are substitutes, and Clint Dempsey has left to join Seattle Sounders. Michael Dawson's goal in a 3-1 win against Reading on 1st January was the last PL home goal scored by a player in Spurs' starting line-up.
9' CHANCE! Routledge gets the first shot on target against his old club as Lloris keeps his stinging 20-yard drive out.
20' FIRST BIG SPURS OPPORTUNITY: Spurs always look capable of breaking with authority even when Swansea are in possession, and with Walker going a great job to create space for a dangerous cross, Williams ends up heading it onto his own post! Paulinho to the rebound but Vorm blocks the shot!
35' WALKER A THREAT AGAIN: Another explosive run down the right by Walker takes him to the by-line and his cut-back evades Townsend but finds Dembele! Great full-stretch save by Vorm to tip over the bar!
44' PENALTY SHOUT #1: Townsend has the ball on the opposite flank and moves towards the area where Shelvey is adjudged to bring him down just outside the box. However, it looked a) inside the box and b) like Townsend was already going down.
58' PENALTY SHOUT #2: Shelvey on Townsend again! And this time it's a penalty to Spurs! Soldado steps up to the spot... and it's in! 1-0 Tottenham!
71' CLOSEST SNIFF OF A LEVELLER: Great parry by Lloris for a corner as Chico catches a free-kick delivery sweet with a lovely far-post volley!
Life without Bale continues for Tottenham in what could be their final fixture before the Welshman's record transfer to Real Madrid is confirmed. Of course, it's hard to argue at the moment that the side last season called a 'one-man team' even need their talisman of the last three seasons. The North Londoners have invested well on initial impressions - and there are still seven days to add another name or two, with Vlad Chiriches on the way in from Steaua Bucharest.
Tottenham have now won 10 and lost just one of their last 13 Premier League home games.
Swansea have won just one of their last 10 Premier League away games (L6 D3), failing to score in six of these matches. They've also lost and failed to score in four of their last five Premier League trips to London.
Swansea City have won just two of their 13 Premier League games since winning the Capital One Cup in February 2013 (D3 L7).
Roberto Soldado opened his goalscoring account for Spurs at Crystal Palace and has now scored 12 goals in his last 10 league fixtures.
MAN OF THE MATCH
Andros Townsend, Tottenham - The home side's midfield were almost completely on top form, and though Paulinho was a joy to behold going forward and Etienne Capoue was superb in front of the back four, the academy graduate provided quality at both ends and won what could easily have been two penalties.
TOTTENHAM: Lloris 8, Walker 8, Vertonghen 7, Dawson 8, Rose 8, Townsend 9, Dembele 6, Capoue 8, Paulinho 8, Chadli 7, Soldado 8. Subs: Defoe n/a, Sigurdsson 6, Sandro n/a
SWANSEA: Vorm 8, Rangel 6, Chico Flores 7, Williams 6, Davies 5, Canas 5, de Guzman 5, Shelvey 5, Routledge 7, Hernandez 6, Michu 5. Subs: Pozuelo 5, Bony 5.
THE MATCH IN A TWEET