Short for 'Sneak Attack by Roger', it involves rushing towards the net at the moment of a second serve and chipping back the ball, shortening his opponent's response time.
The Swiss 17-time Grand Slam winner who was in Singapore for the International Premier Tennis League (IPTL), successfully employed it against Novak Djokovic at the Cincinnati final in August.

"I would love to keep trying it, now I have time to practise, so I am sure I will spend some time on that as well and see if, it's something I should keep up," said the 34-year-old.
"I am happy that it kind of worked, it was fun and it was all over the news, I thought it was quite exciting for me personally," he said, giving credit to head coach Severin Luthi for the tactic. Federer enters the 2016 season with a new coaching team after replacing his idol Stefan Edberg with a new assistant coach, Croatian Ivan Ljubijic.

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