The 25-year-old has steadily improved for Tottenham Hotspur this campaign.
As Tottenham's promising season continues, many will freely admit they didn't see a few things coming.
The first is Eric Dier moving to midfield - and duly excelling in the middle of the park. The second is just how well Dele Alli has adapted to the Premier League, even if some predicted long-term success for him.
But, arguably, neither of them are Tottenham's biggest surprise package thus far.
Indeed, Dier showed plenty of good signs last season and, even though it was League One, so did Alli. Someone who didn't show anywhere near the same form was Kyle Walker.
And yet the right-back has been a constant fixture in the Tottenham side this season, generally impressing and, during the north London derby, excelling.
Last term, especially towards the end of the campaign, Walker put in some truly dire performances. The 25-year-old's form was, at times, woeful - and many fans were virtually praying for him to be replaced.
But the right-back's injury problems certainly affected him. Waker's fitness has improved this time around and the difference has been palpable for Spurs.
His general game has improved, too. Mauricio Pochettino deserves credit and so does the defender himself. Defensively, there is still plenty of room for further improvement - but big strides have already been made.
Going forward, Walker is also far more dangerous, while Kieran Trippier hasn't been given a sniff due to his poor showings and the 25-year-old's solid displays.
While the likes of Alli, Dier, Toby Alderweireld and more have been big success stories for Tottenham, then, no one has arguably made as much of a transformation as Walker. From a liability to a very surprise performer indeed.