Son Heung-min scored two superb goals as Tottenham moved up to second in the Premier League with victory at Middlesbrough.

On a windy day at the Riverside Stadium, Spurs took the lead when Son feinted to shoot twice in the area before striking a low 10-yard effort.
The South Korean made it 2-0 when he wriggled out of a tight position and curled in from edge of the area.
Boro improved after the break and pulled a goal back through Ben Gibson.
Tottenham's win means they have made their best start in the top flight for 51 years.
Since joining Spurs at the start of last season, Son has often been the foil to Harry Kane's role as lead striker.
The 24-year-old's industry and unselfish play around the attacking areas has complemented the more predatory Kane, who has grabbed the goals, headlines and adulation.
With Kane injured, though, Son showed himself a more than able understudy.
Both of his goals were wonderful. The first saw him play a one-two with Vincent Janssen, fool both Adam Clayton and Calum Chambers, then shoot past Victor Valdes.
His second was better.
There looked to be little threat to the Boro goal as Son reached the byeline on the right of the area. However, the forward then wriggled out of his tight position, before turning and firing a fantastic low curling shot into the far corner.
Spurs fans will not want to be reminded of their side letting leads slip.
In the last four games of the 2015-16 campaign, it happened on three occasions - two resulted in draws and one in a 2-1 defeat by Southampton. Not only did their title hopes evaporate but they also failed to hold on to second spot.
On Saturday, they dominated a flaky Boro side during the first half. But after the break, Mauricio Pochettino's side appeared to ease off the pressure, allowing the home side back in.
Had Boro been more potent in attack, it might yet again have been a case of 'one that got away'.