On Sunday, Rafael Nadal took a brief pause from questioning by journalists at the press conference following the Spaniard's loss in the Shanghai final to Roger Federer.
Smiling warmly, the world number one paused, with a journalist speaking mid-question, to silence his phone which vibrated on the podium in front of him.
Raising an amused eyebrow, the 31-year-old said: "My mum doesn't know that I'm in press conference."
Federer beat Nadal 6-4 6-3 in the Shanghai Masters title.
That rounded out the Swiss' streak over Nadal to five consecutive wins, four of which came this year alone.
In the grand scheme of things, Nadal still has 23 head-to-head wins over Federer's 15, but the last time the Spaniard beat Federer was at the Australian Open all the way back in 2014.
The win brings the 36-year-old Swiss his 94th career title, placing him in joint second place with Ivan Lendl for most ATP Tour title wins.
Federer is the only threat to Nadal's prime position in 2017. The Swiss still remains the underdog: Oddschecker, a betting site, gives him only a 6/1 shot at dethroning Nadal.
Hardly inspiring, but not impossible.
Whether or not that happens depends on the two rivals' relative performances at Basel, Paris, and the World Tour Final at the O2.
Federer has said he intends to focus his energy on London: "I'll go home and we will work out where I play next - Basel, Paris, one of those or none, before I go to London, which is my priority.
"World number one I don't think will happen but if I play like this maybe I'll get close, who knows?"
Watch Nadal's press conference get interrupted below. [Scroll to 6:40 to see his reaction]
Nadal credits Federer's strategic resting periods for his success: "Roger did great in all the events that he played so looks like he saved his body. He did the right thing."
The ATP Finals will take place from November 12-19 at the O2 Arena, London.