The Belgian shortly made amends on the different finish with a thumping end earlier than Son adopted up after Pepe Reina had saved his penalty to place the guests in entrance.
Slack defending threatened to value Tottenham all three factors after they allowed Bjorn Engels to equalise early within the second half.
However, Engels was the offender to value Villa a degree of their battle to beat the drop as he miscontrolled an extended ball ahead within the 94th minute and Son sprinted clear to complete calmly.
Alderweireld had not travelled along with his teammates to Birmingham after attending the beginning of his baby on Saturday and admitted to feeling heavy legged after he turned Anwar El Ghazi’s deflected cross into his personal web after simply 9 minutes.
Tottenham have been in all places defensively and solely a goal-line block from Ben Davies denied Douglas Luiz from doubling Villa’s lead from Jack Grealish’s move moments later.
However, Villa discover themselves in a relegation battle resulting from their very own defensive deficiencies.
No workforce in the Premier League have now conceded greater than Dean Smith’s males.
Alderweireld made amends for his earlier error by smashing a free ball from a nook excessive previous the helpless Reina.
A rash problem by Engels on Steven Bergwijn handed the guests the possibility to go in entrance simply earlier than the break, albeit it took a VAR evaluate to award a penalty.
Son’s spot-kick was saved by Reina, however the South Korean adopted as much as prod dwelling and develop into the primary Asian participant to attain 50 Premier League objectives.
But Spurs allowed Villa again into the sport early within the second half.
El Ghazi fired the warning shot that Hugo Lloris did properly to save lots of.
Yet, Mourinho could have been livid at how simple his facet made it for Engels to move dwelling a Grealish nook on 53 minutes.
Tottenham took the sport to the hosts within the ultimate quarter, however struggled to discover a well past the impressed Reina.
Son positioned a shot too near the Spanish goalkeeper from the sting of the field; Villa defenders scrambled to dam Bergwijn’s effort behind earlier than Reina once more stood tall to dam from Alli.
The on-loan AC Milan stopper was wanted to carry out extra heroics within the closing phases as he twice denied Son.
However, the South Korean had the ultimate say by composing himself to fit simply past Reina’s attain with nearly the final motion of the sport and ship Spurs nearer to a fifth straight season of Champions League soccer.