He's the first Asian player to win the Premier League's monthly award - an award stretching back to 1994, coincidentally, first won by our German legend Jurgen Klinsmann.
Sonny enjoyed a spectacular September with four goals in two away victories at Stoke and Middlesbrough and away from the Premier League, scored a crucial winner in the Champions League at CSKA Moscow.
It's quite a turn around from what the player admits was a tough first season in the Premier League - he's already matched his goals tally of four in 28 appearances last term.
"In football, if you work hard, believe and have patience, you will always be paid back," said Mauricio. "In this case with Sonny, that's what has happened.
"I'm pleased for him and it’s a great example for all, present and future.
"He’s more mature than when he arrived a year ago - a young player and a player from another country will always need time to adapt and settle. We’re very happy with him. He’s scored a lot of goals and helped the team achieve points."
PREMIER LEAGUE POTM - SPURS WINNERS
Jurgen Klinsmann (August 1994)
David Ginola (December 1998)
Ledley King (September 2004)
Dimitar Berbatov (April 2007)
Robbie Keane (April 2007)
Jermain Defoe (August 2009)
Gareth Bale (April 2010, January 2012, February 2013)
Rafael van der Vaart (October 2010)
Scott Parker (November 2011)
Jan Vertonghen (March 2013)
Harry Kane (January 2015, February 2015, March 2016)
Heung-Min Son (September, 2016)