Plenty of Tottenham fans have been full of praise for their homegrown central midfielder this season, although it has to be said many of them were slating him last term.
It always seems as though one central midfielder has to be off form and, on this occasion, it's Nabil Bentaleb (now injured, anyway). In Mason and Eric Dier, though, Tottenham may have finally solved their midfield conundrum.
Against Sunderland, the former was brilliant, despite a slow start, and took the game by the scruff of the neck. Doing that more often will provide a huge boost indeed for the White Hart Lane outfit.
Amazingly, the 24-year-old changed the game (alongside Erik Lamela, who got the assist) for Tottenham. Both he and Lamela were brought on in the second half and offered the north London side what they didn't have for the first hour of their Sunderland clash.
It's not that there was anything wrong with Heung-Min Son but it was his debut and he visibly lacked a little decisiveness and end product. Townsend burst in, though, acting like he's been beating his man for months. In truth, he rarely ever beats his man anymore these days. Or are we finally about to see a new Townsend?
As with all things, however, it certainly wasn't all positive for Spurs against Sunderland. In fact, for 75 minutes, this was one of the worst games of football since.. well, Tottenham v Burnley last season.
And one of the north London side's biggest negatives was Nacer Chadli. It seemed the introduction of Heung-Min Son had inspired a rejuvenated Townsend and Erik Lamela to better things - at least trying harder to make an impression.
Chadli, however, demonstrated quite the opposite effect. The 26-year-old was languid throughout and plenty of fans are calling for him to be rested. Supporters have been calling for that for some months, though. Mauricio Pochettino isn't a fan of 'rest.' Although it's a pretty basic option he should start to use - especially with Chadli.